CA2914230A1 - Antimicrobial compounds and compositions - Google Patents
Antimicrobial compounds and compositions Download PDFInfo
- Publication number
- CA2914230A1 CA2914230A1 CA2914230A CA2914230A CA2914230A1 CA 2914230 A1 CA2914230 A1 CA 2914230A1 CA 2914230 A CA2914230 A CA 2914230A CA 2914230 A CA2914230 A CA 2914230A CA 2914230 A1 CA2914230 A1 CA 2914230A1
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- 230000000845 anti-microbial effect Effects 0.000 title claims abstract description 23
- 239000000203 mixture Substances 0.000 title abstract description 13
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- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 47
- 239000001257 hydrogen Substances 0.000 claims abstract description 45
- 125000003118 aryl group Chemical group 0.000 claims abstract description 44
- 125000000623 heterocyclic group Chemical group 0.000 claims abstract description 26
- 125000003710 aryl alkyl group Chemical group 0.000 claims abstract description 19
- OHENQANLQNOMAO-UHFFFAOYSA-N oxaborole Chemical group O1B=CC=C1 OHENQANLQNOMAO-UHFFFAOYSA-N 0.000 claims abstract description 16
- 235000013372 meat Nutrition 0.000 claims abstract description 12
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- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 21
- 229910052796 boron Inorganic materials 0.000 claims description 15
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical group [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 14
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- XFNJVJPLKCPIBV-UHFFFAOYSA-N trimethylenediamine Chemical compound NCCCN XFNJVJPLKCPIBV-UHFFFAOYSA-N 0.000 claims description 14
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- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 7
- FOTKYAAJKYLFFN-UHFFFAOYSA-N decane-1,10-diol Chemical compound OCCCCCCCCCCO FOTKYAAJKYLFFN-UHFFFAOYSA-N 0.000 claims description 7
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- 239000010703 silicon Substances 0.000 description 1
- 125000003808 silyl group Chemical group [H][Si]([H])([H])[*] 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 125000003003 spiro group Chemical group 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 125000003107 substituted aryl group Chemical group 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 125000000475 sulfinyl group Chemical group [*:2]S([*:1])=O 0.000 description 1
- 125000005864 sulfonamidyl group Chemical group 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-O sulfonium group Chemical group [SH3+] RWSOTUBLDIXVET-UHFFFAOYSA-O 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 125000003831 tetrazolyl group Chemical group 0.000 description 1
- 125000001113 thiadiazolyl group Chemical group 0.000 description 1
- 125000004627 thianthrenyl group Chemical group C1(=CC=CC=2SC3=CC=CC=C3SC12)* 0.000 description 1
- 125000000335 thiazolyl group Chemical group 0.000 description 1
- 125000001544 thienyl group Chemical group 0.000 description 1
- 125000005297 thienyloxy group Chemical group S1C(=CC=C1)O* 0.000 description 1
- 125000004001 thioalkyl group Chemical group 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- 238000013518 transcription Methods 0.000 description 1
- 230000035897 transcription Effects 0.000 description 1
- 125000004306 triazinyl group Chemical group 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000004417 unsaturated alkyl group Chemical group 0.000 description 1
- 241000228158 x Triticosecale Species 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/02—Boron compounds
- C07F5/025—Boronic and borinic acid compounds
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N55/00—Biocides, pest repellants or attractants, or plant growth regulators, containing organic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen and sulfur
- A01N55/08—Biocides, pest repellants or attractants, or plant growth regulators, containing organic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen and sulfur containing boron
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/34—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
- A23L3/3454—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of liquids or solids
- A23L3/3463—Organic compounds; Microorganisms; Enzymes
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/34—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
- A23L3/3454—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of liquids or solids
- A23L3/3463—Organic compounds; Microorganisms; Enzymes
- A23L3/3481—Organic compounds containing oxygen
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/34—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
- A23L3/3454—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of liquids or solids
- A23L3/3463—Organic compounds; Microorganisms; Enzymes
- A23L3/3544—Organic compounds containing hetero rings
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Polymers & Plastics (AREA)
- Food Science & Technology (AREA)
- Nutrition Science (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Microbiology (AREA)
- Organic Chemistry (AREA)
- Pest Control & Pesticides (AREA)
- Environmental Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Dentistry (AREA)
- Agronomy & Crop Science (AREA)
- Wood Science & Technology (AREA)
- Plant Pathology (AREA)
- Zoology (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
- Pretreatment Of Seeds And Plants (AREA)
- Catching Or Destruction (AREA)
Abstract
Antimicrobial compounds of formula R A - L A - G - L B - R B
wherein each of R A and R B is independently a radical comprising an oxaborole moiety; each of L A and L B is independently -O-, (see formula I), (see formula II) (see formula III), or (see formula IV);
each of R and R' is independently hydrogen, unsubstituted or substituted Cc1-18 -alkyl, arylalkyl, aryl, or heterocyclic moiety; and G is a substituted or unsubstituted C1-18 -alkylene, arylalkylene, arylene, or heterocyclic moiety, and/or compositions thereof, and/or combinations therewith, useful against pathogens affecting meats, plants, or plant parts are disclosed.
wherein each of R A and R B is independently a radical comprising an oxaborole moiety; each of L A and L B is independently -O-, (see formula I), (see formula II) (see formula III), or (see formula IV);
each of R and R' is independently hydrogen, unsubstituted or substituted Cc1-18 -alkyl, arylalkyl, aryl, or heterocyclic moiety; and G is a substituted or unsubstituted C1-18 -alkylene, arylalkylene, arylene, or heterocyclic moiety, and/or compositions thereof, and/or combinations therewith, useful against pathogens affecting meats, plants, or plant parts are disclosed.
Description
ANTIMICROBIAL COMPOUNDS AND COMPOSITIONS
BACKGROUND OF THE INVENTION
[0001] A number of compounds containing an oxaborole ring have been disclosed previously. However, there has been no teaching that these oxaborole compounds are volatile antimicrobial agents. In addition, these has been no teaching for adducting or conjugating these oxaborole compounds while maintaining their antimicrobial activity and/or volatility.
BACKGROUND OF THE INVENTION
[0001] A number of compounds containing an oxaborole ring have been disclosed previously. However, there has been no teaching that these oxaborole compounds are volatile antimicrobial agents. In addition, these has been no teaching for adducting or conjugating these oxaborole compounds while maintaining their antimicrobial activity and/or volatility.
[0002] Thus, there remains a need to develop new use of various volatile antimicrobial agents, and/or combination with a volatile plant growth regulator, in particular for agricultural applications.
SUMMARY OF THE INVENTION
SUMMARY OF THE INVENTION
[0003] This invention is related to use of antimicrobial compounds and/or compositions against pathogens affecting meats, plants, or plant parts. In one embodiment, the provided antimicrobial compounds are volatile as adducted products of certain oxaborole moieties.
Delivery systems are provided to take advantage of the volatile nature of these antimicrobial compounds and/or compositions. Also combinations with a volatile plant growth regulator, for example 1-methylcyclopropene, are disclosed.
Delivery systems are provided to take advantage of the volatile nature of these antimicrobial compounds and/or compositions. Also combinations with a volatile plant growth regulator, for example 1-methylcyclopropene, are disclosed.
[0004] In one aspect, provided is an antimicrobial compound having a structure of formula (A): RA ¨ LA ¨ G ¨ LB ¨ RB (A), wherein each of RA and RB is independently a radical comprising an oxaborole moiety;
each of LA and LB is independently ¨0¨, ¨N¨, ¨B¨ ¨P¨, or Ri ;
each of R and R' is independently hydrogen, unsubstituted or substituted C1_18 -alkyl, arylalkyl, aryl, or heterocyclic moiety;
G is a substituted or unsubstituted C1_18 -alkylene, arylalkylene, arylene, or heterocyclic moiety;
and agriculturally acceptable salts thereof.
each of LA and LB is independently ¨0¨, ¨N¨, ¨B¨ ¨P¨, or Ri ;
each of R and R' is independently hydrogen, unsubstituted or substituted C1_18 -alkyl, arylalkyl, aryl, or heterocyclic moiety;
G is a substituted or unsubstituted C1_18 -alkylene, arylalkylene, arylene, or heterocyclic moiety;
and agriculturally acceptable salts thereof.
[0005] In one embodiment, the antimicrobial compound is a volatile compound. In another embodiment, the antimicrobial compound has use against pathogens affecting meats, plants, or plant parts, comprising contacting the meats, plants, or plant parts. In another embodiment, the - LA - G - LB - portion of formula (A) is derived from a diol or diamine compound. In a further embodiment, the diol compound is selected from the group consisting of 1,2-ethylene glycol;
1,2-propylene glycol; 1,3-propylene glycol; 1,1,2,2-tetramethyl-1,2-ethylene glycol; 2,2-dimethy1-1,3-propylene glycol; 1,6-hexanediol; 1,10-decanediol; and combinations thereof In another embodiment, the diamine compound is 1,2-ethylene diamine; 1,3-propylene diamine; or combinations thereof In another embodiment, each of LA and LB is independently -0- or -NH-In another embodiment, LA and LB are identical. In another embodiment, LA and LB are different. In another embodiment, G is a substituted or unsubstituted Ci_g -alkylene. In a further embodiment, G is a substituted or unsubstituted Ci_4 -alkylene. In a further embodiment, G is selected from -CH2-, -CH2-CH2-, and -CH2-CH2-CH2-=
1,2-propylene glycol; 1,3-propylene glycol; 1,1,2,2-tetramethyl-1,2-ethylene glycol; 2,2-dimethy1-1,3-propylene glycol; 1,6-hexanediol; 1,10-decanediol; and combinations thereof In another embodiment, the diamine compound is 1,2-ethylene diamine; 1,3-propylene diamine; or combinations thereof In another embodiment, each of LA and LB is independently -0- or -NH-In another embodiment, LA and LB are identical. In another embodiment, LA and LB are different. In another embodiment, G is a substituted or unsubstituted Ci_g -alkylene. In a further embodiment, G is a substituted or unsubstituted Ci_4 -alkylene. In a further embodiment, G is selected from -CH2-, -CH2-CH2-, and -CH2-CH2-CH2-=
[0006] In another embodiment, each of RA and RB is independently derived from the group consisting of 5-fluoro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole; 5-chloro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole; 1,3-dihydro-1-hydroxy-2,1-benzoxaborole; and combinations thereof In another embodiment, RA and RB are identical. In another embodiment, RA and RB
are different.
are different.
[0007] In another embodiment, each of RA and RB is independently selected from formula (B), (C), (D), (E), (F), or (G):
B C 1 b (12 eõo, , /\ P\
qi 2 (11 (B), ' R
(C), (D)
B C 1 b (12 eõo, , /\ P\
qi 2 (11 (B), ' R
(C), (D)
[0008] wherein ql and q2 are independently 1, 2, or 3;
[0009] q3 = 0, 1, 2, 3, or 4;
[0010] B is boron;
[0011] M is hydrogen, halogen, -OCH3, or -CH2-0-CH2-0-CH3;
[0012] A41 is halogen, -CH2OH, or -OCH3;
[0013] X is 0, S, or NRic, wherein Ric is hydrogen, substituted alkyl, or unsubstituted alkyl;
[0014] R1, Ria5 Rib, -25 K and R5 are independently hydrogen, OH, NH2, SH, CN, NO2, SO2, 0S020H, OSO2NH2, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl; or
[0015]
i e......õ.-B\
R6(n)¨ 1 /0 (E)
i e......õ.-B\
R6(n)¨ 1 /0 (E)
[0016] wherein each R6 is independently hydrogen, alkyl, alkene, alkyne, haloalkyl, haloalkene, haloalkyne, alkoxy, alkeneoxy, haloalkoxy, aryl, heteroaryl, arylalkyl, arylalkene, arylalkyne, heteroarylalkyl, heteroarylalkene, heteroarylalkyne, halogen, hydroxyl, nitrile, amine, ester, carboxylic acid, ketone, alcohol, sufide, sulfoxide, sulfone, sulfoximine, sulfilimine, sulfonamide, sulfate, sulfonate, nitroalkyl, amide, oxime, imine, hydroxylamine, hydrazine, hydrazone, carbamate, thiocarbamate, urea, thiourea, carbonate, aryloxy, or heteroaryloxy;
[0017] n = 1, 2, 3, or 4;
[0018] B is boron;
[0019] X2 = (CR62)m where m = 1, 2, 3, or 4; or
[0020]
DBi 1 \
(F)
DBi 1 \
(F)
[0021] wherein A and D together with the carbon atoms to which they are attached form a 5, 6, or 7-membered fused ring which may be substituted by C1_6 -alkyl, C1_6 -alkoxy, hydroxy, halogen, nitro, nitrile, amino, amino substituted by one or more Ci_6 -alkyl groups, carboxy, acyl, aryloxy, carbonamido, carbonamido substituted by C1_6 -alkyl, sulphonamido or trifluoromethyl or the fused ring may link two oxaborole rings; B is boron;
[0022] Xl is a group -CR7R8 wherein R7 and R8 are each independently hydrogen, C1-6 -alkyl, nitrile, nitro, aryl, aralkyl or R7 and R8 together with the carbon atom to which they are attached form an alicyclic ring; or
[0023]
Rio B
1 10 \O
1...-,:z......õ. .............õõ
X3 0 (G)
Rio B
1 10 \O
1...-,:z......õ. .............õõ
X3 0 (G)
[0024] wherein R9 is CN, C(0)NRiiRi 25 or C(0)0R13 wherein R13 is hydrogen, substituted alkyl, or unsubstituted alkyl,
[0025] X3 is N, CH and CR1 ;
[0026] R1 is halogen, substituted or unsubstituted alkyl, C(0)R14, C(0)0R14, OR14, NR14R15, wherein each of R", R125 R'4, and R15 is independently hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl;
[0027] and agriculturally acceptable salts thereof
[0028] In another embodiment, the antimicrobial compound has a structure of formula (Al) or (A2):
1 O'GO D1 D
_____________________________ / \
B B
/ \
Al 0 0 Al (Al) \ G /
N' ------N D2 / \
B B
/ \
(A2)
1 O'GO D1 D
_____________________________ / \
B B
/ \
Al 0 0 Al (Al) \ G /
N' ------N D2 / \
B B
/ \
(A2)
[0029] wherein each of A1, A2, D1, and D2 is independently hydrogen, substituted or unsubstituted C1_18 -alkyl, arylalkyl, aryl, or heterocyclic; or A1 and D1, or A2 and D2 together form a 5, 6, or 7-membered fused ring which is substituted or unsubstituted;
[0030] each of R16, R17, R18, and R19 is independently hydrogen, substituted or unsubstituted C1_6 -alkyl, nitrile, nitro, aryl or aryl alkyl; or R16 and R17, or R18 and R19 together form an alicyclic ring which is substituted or unsubstituted;
[0031] B is boron; and
[0032] G is a substituted or unsubstituted C118 -alkylene, arylalkylene, arylene, or heterocyclic moiety;
[0033] and agriculturally acceptable salts thereof.
[0034] In another embodiment, each of RA and RB is independently Or wherein X2 = (CR62)m and m = 1, 2, 3, or 4.
[0035] In another embodiment, each of RA and RB is independently B\0 Or
[0036] In another embodiment, the antimicrobial compound has the structure of Bi \ 0 F.
0/\B
0/\B
[0037] In another aspect, provided is a mixture or composition comprising the antimicrobial compound described herein. In one embodiment, the mixture of composition further comprises a cyclopropene compound. In a further embodiment, the cyclopropene compound is of the formula:
oto wherein R is a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, phenyl, or naphthyl group; wherein the substituents are independently halogen, alkoxy, or substituted or unsubstituted phenoxy. In one embodiment, R is C1_8 alkyl. In another embodiment, R is methyl.
oto wherein R is a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, phenyl, or naphthyl group; wherein the substituents are independently halogen, alkoxy, or substituted or unsubstituted phenoxy. In one embodiment, R is C1_8 alkyl. In another embodiment, R is methyl.
[0038] In another embodiment, the cyclopropene compound is of the formula:
wherein Rl is a substituted or unsubstituted Ci-C4 alkyl, Ci-C4 alkenyl, Ci-C4 alkynyl, Ci-C4 cylcoalkyl, cylcoalkylalkyl, phenyl, or napthyl group; and R2, R3, and R4 are hydrogen. In another embodiment, the cyclopropene comprises 1-methylcyclopropene (1-MCP).
wherein Rl is a substituted or unsubstituted Ci-C4 alkyl, Ci-C4 alkenyl, Ci-C4 alkynyl, Ci-C4 cylcoalkyl, cylcoalkylalkyl, phenyl, or napthyl group; and R2, R3, and R4 are hydrogen. In another embodiment, the cyclopropene comprises 1-methylcyclopropene (1-MCP).
[0039] In another aspect, provided is a method of using an antimicrobial compound against pathogens affecting meats, plants, or plant parts. The method comprises contacting the meats, plants, or plant parts with an effective amount of the antimicrobial compound having a structure of formula (A): RA ¨ LA ¨ G ¨ LB ¨ RB (A), wherein each of RA and RB is independently a radical comprising an oxaborole moiety;
each of LA and LB is independently ¨0¨, ¨N¨, ¨B¨ ¨P¨, or R' =
each of R and R' is independently hydrogen, unsubstituted or substituted C1_18 -alkyl, arylalkyl, aryl, or heterocyclic moiety;
G is a substituted or unsubstituted C118 -alkylene, arylalkylene, arylene, or heterocyclic moiety;
and agriculturally acceptable salts thereof.
each of LA and LB is independently ¨0¨, ¨N¨, ¨B¨ ¨P¨, or R' =
each of R and R' is independently hydrogen, unsubstituted or substituted C1_18 -alkyl, arylalkyl, aryl, or heterocyclic moiety;
G is a substituted or unsubstituted C118 -alkylene, arylalkylene, arylene, or heterocyclic moiety;
and agriculturally acceptable salts thereof.
[0040] In one embodiment, the antimicrobial compound is a volatile compound. In another embodiment, the ¨ LA ¨ G ¨ LB ¨ portion of formula (A) is derived from a diol or diamine compound. In a further embodiment, the diol compound is selected from the group consisting of 1,2-ethylene glycol; 1,2-propylene glycol; 1,3-propylene glycol; 1,1,2,2-tetramethy1-1,2-ethylene glycol; 2,2-dimethy1-1,3-propylene glycol; 1,6-hexanediol; 1,10-decanediol;
and combinations thereof In another embodiment, the diamine compound is 1,2-ethylene diamine;
1,3-propylene diamine; or combinations thereof. In another embodiment, LA and LB are identical. In another embodiment, LA and LB are different. In another embodiment, each of LA and LB
is independently ¨0¨ or ¨NH¨. In another embodiment, LA and LB are identical. In another embodiment, LA and LB are different. In another embodiment, G is a substituted or unsubstituted Ci_g ¨alkylene. In a further embodiment, G is a substituted or unsubstituted Ci_4 ¨alkylene. In a further embodiment, G is selected from ¨CH2¨, ¨CH2¨CH2¨, and ¨CH2¨CH2¨CH2¨.
and combinations thereof In another embodiment, the diamine compound is 1,2-ethylene diamine;
1,3-propylene diamine; or combinations thereof. In another embodiment, LA and LB are identical. In another embodiment, LA and LB are different. In another embodiment, each of LA and LB
is independently ¨0¨ or ¨NH¨. In another embodiment, LA and LB are identical. In another embodiment, LA and LB are different. In another embodiment, G is a substituted or unsubstituted Ci_g ¨alkylene. In a further embodiment, G is a substituted or unsubstituted Ci_4 ¨alkylene. In a further embodiment, G is selected from ¨CH2¨, ¨CH2¨CH2¨, and ¨CH2¨CH2¨CH2¨.
[0041] In another embodiment, each of RA and RB is independently derived from the group consisting of 5-fluoro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole; 5-chloro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole; 1,3-dihydro-1-hydroxy-2,1-benzoxaborole; and combinations thereof In another embodiment, RA and Bb are identical. In another embodiment, RA and RB are different.
[0042] In another embodiment, each of RA and RB is independently selected from formula (B), (C), (D), (E), (F), or (G):
-q3 R' R2RI
_ q , qi (B), (C), (D)
-q3 R' R2RI
_ q , qi (B), (C), (D)
[0043] wherein ql and q2 are independently 1, 2, or 3;
[0044] q3 = 0, 1, 2, 3, or 4;
[0045] B is boron;
[0046] M is hydrogen, halogen, -OCH3, or ¨CH2-0-CH2-0-CH3;
[0047] A41 is halogen, -CH2OH, or ¨OCH3;
[0048] X is 0, S, or NRic, wherein Ric is hydrogen, substituted alkyl, or unsubstituted alkyl;
[0049] R1, Ria5 Rib, ¨25 K and R5 are independently hydrogen, OH, NH2, SH, CN, NO2, SO2, 0S020H, OSO2NH2, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl; or
[0050]
R6(n)¨
(E)
R6(n)¨
(E)
[0051] wherein each R6 is independently hydrogen, alkyl, alkene, alkyne, haloalkyl, haloalkene, haloalkyne, alkoxy, alkeneoxy, haloalkoxy, aryl, heteroaryl, arylalkyl, arylalkene, arylalkyne, heteroarylalkyl, heteroarylalkene, heteroarylalkyne, halogen, hydroxyl, nitrile, amine, ester, carboxylic acid, ketone, alcohol, sufide, sulfoxide, sulfone, sulfoximine, sulfilimine, sulfonamide, sulfate, sulfonate, nitroalkyl, amide, oxime, imine, hydroxylamine, hydrazine, hydrazone, carbamate, thiocarbamate, urea, thiourea, carbonate, aryloxy, or heteroaryloxy;
[0052] n= 1, 2, 3, or 4;
[0053] B is boron;
[0054] X2 = (CR62)m where m = 1, 2, 3, or 4; or
[0055]
DB/
1 \
(F)
DB/
1 \
(F)
[0056] wherein A and D together with the carbon atoms to which they are attached form a 5, 6, or 7-membered fused ring which may be substituted by C1_6 -alkyl, C1_6 -alkoxy, hydroxy, halogen, nitro, nitrile, amino, amino substituted by one or more Ci_6 -alkyl groups, carboxy, acyl, aryloxy, carbonamido, carbonamido substituted by Ci_6 -alkyl, sulphonamido or trifluoromethyl or the fused ring may link two oxaborole rings; B is boron;
[0057] Xl is a group ¨CR7R8 wherein R7 and R8 are each independently hydrogen, C1-6 -alkyl, nitrile, nitro, aryl, aralkyl or R7 and R8 together with the carbon atom to which they are attached form an alicyclic ring; or
[0058]
RI
B
R1cl 1 I. 0 X 0 (G)
RI
B
R1cl 1 I. 0 X 0 (G)
[0059] wherein R9 is CN, C(0)NR11R12, or C(0)0R13 wherein R13 is hydrogen, substituted alkyl, or unsubstituted alkyl,
[0060] X3 is N, CH and CR16;
[0061] R1 is halogen, substituted or unsubstituted alkyl, C(0)R14, C(0)0R14, OR14, Nee, wherein each of R", R12, R145 and R15 is independently hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl;
[0062] and agriculturally acceptable salts thereof.
[0063] In another embodiment, the antimicrobial compound has a structure of formula (Al) or (A2):
1 O'GO D1 D
/ \
B.............
/ \
0 0 Al (Al) /
N'G------N D2 D2 \
/ \
A2 (13\ B
/ \
(A2)
1 O'GO D1 D
/ \
B.............
/ \
0 0 Al (Al) /
N'G------N D2 D2 \
/ \
A2 (13\ B
/ \
(A2)
[0064] wherein each of A1, A2, Dl, and D2 is independently hydrogen, substituted or unsubstituted C1_18 -alkyl, arylalkyl, aryl, or heterocyclic; or A1 and Dl, or A2 and D2 together form a 5, 6, or 7-membered fused ring which is substituted or unsubstituted;
[0065] each of R165 R17, R18, and R19 is independently hydrogen, substituted or unsubstituted C1_6 -alkyl, nitrile, nitro, aryl or aryl alkyl; or R16 and R17, or R18 and R19 together form an alicyclic ring which is substituted or unsubstituted;
[0066] B is boron; and
[0067] G is a substituted or unsubstituted C1_18 -alkylene, arylalkylene, arylene, or heterocyclic moiety;
[0068] and agriculturally acceptable salts thereof.
[0069] In another embodiment, each of RA and RB is independently / /
B
F \Or B( \
wherein X2 = (CR62)õ, and m = 1, 2, 3, or 4.
B
F \Or B( \
wherein X2 = (CR62)õ, and m = 1, 2, 3, or 4.
[0070] In another embodiment, each of RA and RB is independently / /
0 B\0 40 B
\
F Or .
0 B\0 40 B
\
F Or .
[0071] In another embodiment, the antimicrobial compound has the structure of 1 \ __ 0 F 0 \
0/\B
0 F.
0/\B
0 F.
[0072] In one embodiment of the method provided, the pathogen is selected from the group consisting of Alternaria spp., Aspergillus spp., Botryospheria spp., Botrytis spp., Byssochlamys spp., Colletotrichum spp., Dip/odia spp., Fusarium spp., Geotrichum spp., Lasiodiplodia spp., Monolinia spp., Mucor spp., Penicillium spp., Pezicula spp., Phomopsis spp., Phytophthora spp., Pythium spp., Rhizoctonia spp., Rhizopus spp., Sclerotinia spp., and Venturia spp. In another embodiment, the pathogen is selected from the group consisting of Erwinia spp., Pectobacterium spp., Pseudomonas spp., Ralstonia spp., Xanthomonas spp.; Salmonella spp., Escherichia spp., Listeria spp., Bacillus spp., Shigella spp., and Staphylococcus spp. In another embodiment, the pathogen is selected from the group consisting of Candida spp., Debaryomyces spp., Bacillus spp., Campylobacter spp., Clostridium spp., Cryptosporidium spp., Giardia spp., Vibrio spp., and Yersinia spp. In another embodiment, the method comprises a pre-harvest treatment or post-harvest treatment. In a further embodiment, the pre-harvest treatment is selected from the group consisting of seed treatment and transplant treatment. In another embodiment, the post-harvest treatment is selected from the group consisting of treatment during field packing, treatment during palletization, in-box treatment, treatment during transportation, and treatment during storage and/or throughout distribution network.
[0073] In another embodiment, the plants or plant parts comprise transgenic plants or transgenic plant parts. In another embodiment, the plants or plant parts are selected from the group consisting of corn, wheat, cotton, rice, soybean, and canola. In another embodiment, the plants or plant parts are selected from the group consisting of fruit, vegetables, nursery, turf and ornamental crops. In a further embodiment, the fruit is selected from the group consisting of banana, pineapple, citrus including oranges, lemon, lime, grapefruit, and other citrus, grapes, watermelon, cantaloupe, muskmelon, and other melons, apple, peach, pear, cherry, kiwifruit, mango, nectarine, guava, papaya, persimmon, pomegranate, avocado, fig, and berries including strawberry, blueberry, raspberry, blackberry, currents and other types of berries. In a further embodiment, the vegetable is selected from the group consisting of tomato, potato, sweet potato, cassava, pepper, bell pepper, carrot, celery, squash, eggplant, cabbage, cauliflower, broccoli, asparagus, mushroom, onion, garlic, leek, and snap bean. A further embodiment, the flower or flower part is selected from the group consisting of roses, carnations, orchids, geraniums, lily or other ornamental flowers. A further embodiment, the meat is selected from the group of beef, bison, chicken, deer, goat, turkey, pork, sheep, fish, shellfish, mollusks, or dry-cured meat products.
[0074] In one embodiment, the contacting comprises applying the volatile antimicrobial compound by ways selected from the group consisting of spray, mist, thermal or non-thermal fogging, drench, gas treatment, and combinations thereof In a further embodiment, the gas treatment is selected from the group consisting of release from a sachet, release from a synthetic or natural film, fibrous material, and/or release from liner or other packaging materials, release from powder, release from a gas-releasing generator, release using a compressed or non-compressed gas cylinder, release from a droplet inside a box, and combinations thereof In another embodiment, the method further comprises contacting the meats, plants, plant parts with a volatile plant growth regulator. In a further embodiment, the volatile plant growth regulator is a cyclopropene compound. In a further embodiment, the cyclopropene compound comprises 1-methylcyclopropene (1-MCP).
[0075] In another aspect, provided is a method of preparing an antimicrobial compound. The method comprises:
(a) mixing at least one oxaborole compound with at least one adducting compound in a first organic solvent;
(b) evaporating the first organic solvent by heating, thereby allowing the at least one adducting compound to react with the at least one oxaborole compound to generate at least one adducted product; and (c) crystallizing the at least one adducted product using a second organic solvent.
(a) mixing at least one oxaborole compound with at least one adducting compound in a first organic solvent;
(b) evaporating the first organic solvent by heating, thereby allowing the at least one adducting compound to react with the at least one oxaborole compound to generate at least one adducted product; and (c) crystallizing the at least one adducted product using a second organic solvent.
[0076] In one embodiment, the first organic solvent is same as the second organic solvent.
In another embodiment, the first organic solvent is toluene. In another embodiment, the first organic solvent is different than the second organic solvent. In another embodiment, the second solvent is toluene or hexane. In another embodiment, the second solvent is hexane.
In another embodiment, the first organic solvent is toluene. In another embodiment, the first organic solvent is different than the second organic solvent. In another embodiment, the second solvent is toluene or hexane. In another embodiment, the second solvent is hexane.
[0077] In another embodiment, the heating is performed at a temperature between 110 C
and 1250 C; between 100 C and 150 C; or between 18 C and 200 C
and 1250 C; between 100 C and 150 C; or between 18 C and 200 C
[0078] In another embodiment, the at least one adducting compound comprises a diol or diamine compound. In a further embodiment, the diol compound is selected from the group consisting of 1,2-ethylene glycol; 1,2-propylene glycol; 1,3-propylene glycol;
1,1,2,2-tetramethy1-1,2-ethylene glycol; 2,2-dimethy1-1,3-propylene glycol; 1,6-hexanediol; 1,10-decanediol; and combinations thereof. In another embodiment, the diamine compound is 1,2-ethylene diamine; 1,3-propylene diamine; or combinations thereof
1,1,2,2-tetramethy1-1,2-ethylene glycol; 2,2-dimethy1-1,3-propylene glycol; 1,6-hexanediol; 1,10-decanediol; and combinations thereof. In another embodiment, the diamine compound is 1,2-ethylene diamine; 1,3-propylene diamine; or combinations thereof
[0079] In another embodiment, the at least one oxaborole compound comprises a compound of a structure selected from formula (B1), (Cl), (D1), (El), (F1), or (G1):
R*
R- R' /
.õ,,_ 1 , L.; '' R q2 .. co (Cl), -1 b-M c /\
RI R
qi Ps, L ' q3 iii Rµ gi - (B1), (D1), OH OH
i D...-------Bi R
e....,......B\ \
0 6(n)¨X (El), A ,( )1/0 (F1), or OH
B
R1() 1 10 0 x3/\
0 (G1) wherein R* is ¨OH and the other substituents are as defined herein for formula (B), (C), (D), (E), (F), or (G).
R*
R- R' /
.õ,,_ 1 , L.; '' R q2 .. co (Cl), -1 b-M c /\
RI R
qi Ps, L ' q3 iii Rµ gi - (B1), (D1), OH OH
i D...-------Bi R
e....,......B\ \
0 6(n)¨X (El), A ,( )1/0 (F1), or OH
B
R1() 1 10 0 x3/\
0 (G1) wherein R* is ¨OH and the other substituents are as defined herein for formula (B), (C), (D), (E), (F), or (G).
[0080] In another embodiment, the at least one oxaborole compound comprises a compound selected from the group consisting of 5-fluoro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole; 5-chloro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole; 1,3-dihydro-1-hydroxy-2,1-benzoxaborole;
and combinations thereof.
and combinations thereof.
[0081] In another embodiment, the at least one oxaborole compound comprises a compound of a structure selected from OH OH
B B
\
0 1 10 0 0 )( F Or X2 wherein X2 = (CR62)m and m = 1, 2, 3, or 4.
B B
\
0 1 10 0 0 )( F Or X2 wherein X2 = (CR62)m and m = 1, 2, 3, or 4.
[0082] In another embodiment, the at least one oxaborole compound comprises a compound of a structure selected from OH
/ OH
/
0 B\ 10 B\
F Or .
/ OH
/
0 B\ 10 B\
F Or .
[0083] In another embodiment, the at least one adducted product comprises a compound having a structure of formula (Al) or (A2):
O'GO D1 Di \
..._.....3 B
/ \
Al 0 0 Al (Al) R1:3 R13 N'G'N
D2 \
\
B B
/ \
A2.....--) 0 0 A2 R18 R19 R18 R19 (A2) wherein the sub stituents are as defined herein for formula (Al) or (A2).
O'GO D1 Di \
..._.....3 B
/ \
Al 0 0 Al (Al) R1:3 R13 N'G'N
D2 \
\
B B
/ \
A2.....--) 0 0 A2 R18 R19 R18 R19 (A2) wherein the sub stituents are as defined herein for formula (Al) or (A2).
[0084] In another embodiment, wherein the at least one adducted product comprises a compound having a structure of /0 ___________________________________ \
0 \
\
F .
0 \
\
F .
[0085] In another embodiment, step (a) is performed at a temperature between 50 C and 60 C; between 40 C and 80 C or between 20 C and 120 C.
[0086] In another embodiment, step (a) is performed in presence of at least one catalyst. In a further embodiment, the catalyst is selected from the group consisting of amine, phosphine, heterocyclic nitrogen, ammonium, phosphonium, arsonium, sulfonium moieties, and combinations thereof In another embodiment, the catalyst is selected from the group consisting of a phosphonium compound, an ammonium compound, chromium salts, amino compounds and combinations thereof In another embodiment, the catalyst is selected from the group consisting of 2-methyl imidazole, 2-phenyl imidazole, an imidazole derivative, 1,8-diazabicyclo[5.4.0]
undec-7-ene (DBU), and combinations thereof.
DETAILED DESCRIPTION OF THE INVENTION
undec-7-ene (DBU), and combinations thereof.
DETAILED DESCRIPTION OF THE INVENTION
[0087] This invention is based on surprising results that two to one adduct of oxaborole compounds can (1) possess volatile property at room temperature; and (2) have antimicrobial activity against for example fungi, especially Botrytis cinerea. One example includes the two to one adduct of 5-fluoro-1-hydroxy-2,1-benzoxaborole , which shows excellent activity against Botrytis cinerea. Volatile antimicrobial agents (for example fungicides) have utility in postharvest disease control. Provided are methods using reaction of certain 1-hydroxybenzoxaborole compounds with certain diol compounds to form compounds having antimicrobial activity, and compounds and/or composition prepared by the methods disclosed.
[0088] Unless otherwise stated, the following terms used in this application, including the specification and claims, have the definitions given below. It must be noted that, as used in the specification and the appended claims, the singular forms "a," "an," and "the"
include plural referents unless the context clearly dictates otherwise. Definition of standard chemistry terms may be found in reference works, including Carey and Sundberg, Advanced Organic Chemistry 4th Ed., Vols. A (2000) and B (2001), Plenum Press, New York, N.Y.
include plural referents unless the context clearly dictates otherwise. Definition of standard chemistry terms may be found in reference works, including Carey and Sundberg, Advanced Organic Chemistry 4th Ed., Vols. A (2000) and B (2001), Plenum Press, New York, N.Y.
[0089] As used herein, the phrase "moiety" refers to a specific segment or functional group of a molecule. Chemical moieties are often recognized chemical entities embedded in or appended to a molecule.
[0090] As used herein, the phrases "heteroatom" and "hetero-" refer to atoms other than carbon (C) and hydrogen (H). Examples of heteroatoms include oxygen (0), nitrogen (N) sulfur (S), silicon (Si), germanium (Ge), aluminum (Al) and boron (B).
[0091] As used herein, the phrases "halo" and "halogen" are interchangeable and refer to fluoro (-F), chloro (-Cl), bromo (-Br), and iodo (-I).
[0092] As used herein, the phrase "alkyl" refers to an unsubstituted or substituted, hydrocarbon group and can include straight, branched, cyclic, saturated and/or unsaturated features. Although the alkyl moiety may be an "unsaturated alkyl" moiety, which means that it contains at least one alkene or alkyne moiety, typically, the alkyl moiety is a "saturated alkyl"
group, which means that it does not contain any alkene or alkyne moieties.
Likewise, although the alkyl moiety may be a cyclic, typically the alkyl moiety is a non-cyclic group. Thus, in some embodiments, "alkyl" refers to an optionally substituted straight-chain, or optionally substituted branched-chain saturated hydrocarbon monoradical having from about one to about thirty carbon atoms in some embodiments, from about one to about fifteen carbon atoms in some embodiments, and from about one to about six carbon atoms in further embodiments. Examples of saturated alkyl radicals include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, 2-methyl-l-propyl, 2-methyl-2-propyl, 2-methyl-l-butyl, 3-methyl-l-butyl, 2-methyl-3 -butyl, 2,2-dimethyl-1-propyl, 2-methyl-l-pentyl, 3-methyl-l-pentyl, 4-methyl-1 -pentyl, 2-methyl-2-pentyl, 3-methy1-2-pentyl, 4-methyl-2-pentyl, 2,2-dimethy1-1-butyl, 3,3-dimethy1-1-butyl, 2-ethyl-1-=
butyl, butyl, isobutyl, sec-butyl, t-butyl, n-pentyl, isopentyl, neopentyl, and n-hexyl, and longer alkyl groups, such as heptyl, and octyl. It should be noted that whenever it appears herein, a numerical range such as "1 to 6" refers to each integer in the given range;
e.g., "1 to 6 carbon atoms" or "C1_6" or "C1-C6" means that the alkyl group may consist of 1 carbon atom, 2 carbon atoms, 3 carbon atoms, 4 carbon: atoms, 5 carbon atoms, and/or 6 carbon atoms, although the present definition also covers the occurrence of the term "alkyl" where no numerical range is designated.
group, which means that it does not contain any alkene or alkyne moieties.
Likewise, although the alkyl moiety may be a cyclic, typically the alkyl moiety is a non-cyclic group. Thus, in some embodiments, "alkyl" refers to an optionally substituted straight-chain, or optionally substituted branched-chain saturated hydrocarbon monoradical having from about one to about thirty carbon atoms in some embodiments, from about one to about fifteen carbon atoms in some embodiments, and from about one to about six carbon atoms in further embodiments. Examples of saturated alkyl radicals include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, 2-methyl-l-propyl, 2-methyl-2-propyl, 2-methyl-l-butyl, 3-methyl-l-butyl, 2-methyl-3 -butyl, 2,2-dimethyl-1-propyl, 2-methyl-l-pentyl, 3-methyl-l-pentyl, 4-methyl-1 -pentyl, 2-methyl-2-pentyl, 3-methy1-2-pentyl, 4-methyl-2-pentyl, 2,2-dimethy1-1-butyl, 3,3-dimethy1-1-butyl, 2-ethyl-1-=
butyl, butyl, isobutyl, sec-butyl, t-butyl, n-pentyl, isopentyl, neopentyl, and n-hexyl, and longer alkyl groups, such as heptyl, and octyl. It should be noted that whenever it appears herein, a numerical range such as "1 to 6" refers to each integer in the given range;
e.g., "1 to 6 carbon atoms" or "C1_6" or "C1-C6" means that the alkyl group may consist of 1 carbon atom, 2 carbon atoms, 3 carbon atoms, 4 carbon: atoms, 5 carbon atoms, and/or 6 carbon atoms, although the present definition also covers the occurrence of the term "alkyl" where no numerical range is designated.
[0093] As used herein, the phrase "substituted alkyl" refers to an alkyl group, as defined herein, in which one or more (up to about five, preferably up to about three) hydrogen atoms is replaced by a substituent independently selected from the substituent group defined herein.
[0094] As used herein, the phrases "substituents" and "substituted" refer to groups which may be used to replace another group on a molecule. Such groups are known to those of skill in the chemical arts and may include, without limitation, one or more of the following =
independently selected groups, or designated subsets thereof: halogen, -CN, -OH, -NO2, -N3, =0, =S, =NH, -SO2, -NH2, -COOH, -S(02), nitroalkyl, amino, including mono- and di-substituted amino groups, cyanato, isocyanato, thiocyanato, isothiocyanato, guanidinyl, 0-carbamyl, N-carbamyl, thiocarbamyl, uryl, isouryl, thiouryl, isothiouryl, mercapto, sulfanyl, sulfinyl, sulfonyl, sulfonamidyl, phosphonyl, phosphatidyl, phosphoramidyl, dialkylamino, diarylamino, diarylalkylamino; and the protected compounds thereof. The protecting groups that may form the protected compounds of the above substituents are known to those of skill in the art and may be found in references such as Greene and Wuts, Protective Groups in Organic Synthesis, 3d Ed., John Wiley & Sons, New York, N.Y. (1999) and Kocienski, Protective Groups, Thieme Verlag, New York, N.Y. (1994).
independently selected groups, or designated subsets thereof: halogen, -CN, -OH, -NO2, -N3, =0, =S, =NH, -SO2, -NH2, -COOH, -S(02), nitroalkyl, amino, including mono- and di-substituted amino groups, cyanato, isocyanato, thiocyanato, isothiocyanato, guanidinyl, 0-carbamyl, N-carbamyl, thiocarbamyl, uryl, isouryl, thiouryl, isothiouryl, mercapto, sulfanyl, sulfinyl, sulfonyl, sulfonamidyl, phosphonyl, phosphatidyl, phosphoramidyl, dialkylamino, diarylamino, diarylalkylamino; and the protected compounds thereof. The protecting groups that may form the protected compounds of the above substituents are known to those of skill in the art and may be found in references such as Greene and Wuts, Protective Groups in Organic Synthesis, 3d Ed., John Wiley & Sons, New York, N.Y. (1999) and Kocienski, Protective Groups, Thieme Verlag, New York, N.Y. (1994).
[0095] As used herein, the phrase "alkoxy" refers to the group ¨0-alkyl, where alkyl is as defined herein. In one embodiment, alkoxy groups include, e.g., methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, tert-butoxy, sec-butoxy, n-pentoxy, n-hexoxy, 1,2-dimethylbutoxy, and the like. The alkoxy can be =substituted or substituted.
[0096] As used herein, the phrases "cyclic" and "membered ring" refer to any cyclic structure, including alicyclic, heterocyclic, aromatic, heteroaromatic and polycyclic fused or non-fused ring systems as described herein. The term "membered" is meant to denote the number of skeletal atoms that constitute the ring. Thus, for example, pyridine, pyran, and pyrimidine are six-membered rings and pyrrole, tetrahydrofuran, and thiophene are five-membered rings.
[0097] As used herein, the phrase "aromatic" refers to a cyclic or polycyclic moiety having a conjugated unsaturated (4n+2)7r electron system (where n is a positive integer), sometimes referred to as a delocalized it electron system.
[0098] As used herein, the phrase "aryl" refers to an optionally substituted, aromatic, cyclic, hydrocarbon monoradical of from six to about twenty ring atoms, preferably from six to about ten carbon atoms and includes fused (or condensed) and non-fused aromatic rings. A fused aromatic ring radical contains from two to four fused rings where the ring of attachment is an aromatic ring, and the other individual rings within the fused ring may be cycloalkyl, cycloalkenyl, cycloalkynyl, heterocycloalkyl, heterocycloalkenyl, heterocycloalkynyl, aromatic, heteroaromatic or any combination thereof. A non-limiting example of a single ring aryl group includes phenyl; a fused ring aryl group includes naphthyl, anthryl, azulenyl;
and a non-fused bi-aryl group includes biphenyl.
and a non-fused bi-aryl group includes biphenyl.
[0099] As used herein, the phrase "substituted aryl" refers to an aryl group, as defined herein, in which one or more (up to about five, preferably up to about three) hydrogen atoms is replaced by a substituent independently selected from the group defined herein, (except as otherwise constrained by the definition for the aryl substituent).
[00100] As used herein, the phrase "heteroaryl" refers to an optionally substituted, aromatic, cyclic monoradical containing from about five to about twenty skeletal ring atoms, preferably from five to about ten ring atoms and includes fused (or condensed) and non-fused aromatic rings, and which have one or more (one to ten, preferably about one to about four) ring atoms selected from an atom other than carbon (i.e., a heteroatom) such as, for example, oxygen, nitrogen, sulfur, selenium, phosphorus or combinations thereof The term heteroaryl includes optionally substituted fused and non-fused heteroaryl radicals having at least one heteroatom. A
fused heteroaryl radical may contain from two to four fused rings where the ring of attachment is a heteroaromatic ring and the other individual rings within the fused ring system may be alicyclic, heterocyclic, aromatic, heteroaromatic or any combination thereof.
The term heteroaryl also includes fused and non-fused heteroaryls having from five to about twelve skeletal ring atoms, as well as those having from five to about ten skeletal ring atoms. Examples of heteroaryl groups include, but are not limited to, acridinyl, benzo[1,3]dioxole, benzimidazolyl, benzindazolyl, benzoisooxazolyl, benzokisazolyl, benzofuranyl, benzofurazanyl, benzopyranyl, benzothiadiazolyl, benzothiazolyl, benzo[b]thienyl, benzothiophenyl, benzothiopyranyl, benzotriazolyl, benzoxazolyl, carbazolyl, carbolinyl, chromenyl, cinnolinyl, furanyl, furazanyl, furopyridinyl, furyl, imidazolyl, indazolyl, indolyl, indolidinyl, indolizinyl, isobenzofuranyl, isoindolyl, isoxazolyl, isoquinolinyl, isothiazolyl, naphthylidinyl, naphthyridinyl, oxadiazolyl, oxazolyl, phenoxazinyl, phenothiazinyl, phenazinyl, phenoxathiynyl, thianthrenyl, phenathridinyl, phenathrolinyl, phthalazinyl, pteridinyl, purinyl, puteridinyl, pyrazyl, pyrazolyl, pyridyl, pyridinyl, pyridazinyl, pyrazinyl, pyrimidinyl, pyrimidyl, pyrrolyl, quinazolinyl, quinolinyl, quinoxalinyl, tetrazolyl, thiadiazolyl, thiazolyl, thienyl, triazinyl, (1,2,3,)- and (1,2,4)-triazolyl and the like, and their oxides where appropriate, such as for example pyridyl-N-oxide.
fused heteroaryl radical may contain from two to four fused rings where the ring of attachment is a heteroaromatic ring and the other individual rings within the fused ring system may be alicyclic, heterocyclic, aromatic, heteroaromatic or any combination thereof.
The term heteroaryl also includes fused and non-fused heteroaryls having from five to about twelve skeletal ring atoms, as well as those having from five to about ten skeletal ring atoms. Examples of heteroaryl groups include, but are not limited to, acridinyl, benzo[1,3]dioxole, benzimidazolyl, benzindazolyl, benzoisooxazolyl, benzokisazolyl, benzofuranyl, benzofurazanyl, benzopyranyl, benzothiadiazolyl, benzothiazolyl, benzo[b]thienyl, benzothiophenyl, benzothiopyranyl, benzotriazolyl, benzoxazolyl, carbazolyl, carbolinyl, chromenyl, cinnolinyl, furanyl, furazanyl, furopyridinyl, furyl, imidazolyl, indazolyl, indolyl, indolidinyl, indolizinyl, isobenzofuranyl, isoindolyl, isoxazolyl, isoquinolinyl, isothiazolyl, naphthylidinyl, naphthyridinyl, oxadiazolyl, oxazolyl, phenoxazinyl, phenothiazinyl, phenazinyl, phenoxathiynyl, thianthrenyl, phenathridinyl, phenathrolinyl, phthalazinyl, pteridinyl, purinyl, puteridinyl, pyrazyl, pyrazolyl, pyridyl, pyridinyl, pyridazinyl, pyrazinyl, pyrimidinyl, pyrimidyl, pyrrolyl, quinazolinyl, quinolinyl, quinoxalinyl, tetrazolyl, thiadiazolyl, thiazolyl, thienyl, triazinyl, (1,2,3,)- and (1,2,4)-triazolyl and the like, and their oxides where appropriate, such as for example pyridyl-N-oxide.
[00101] As used herein, the phrase "substituted heteroaryl" refers to a heteroaryl group, as defined herein, in which one or more (up to about five, preferably up to about three) hydrogen atoms is replaced by a substituent independently selected from the group defined herein.
[00102] As used herein, the phrase "leaving group" refers to a group with the meaning conventionally associated with it in synthetic organic chemistry, i.e., an atom or group displaceable under substitution reaction conditions. Examples of leaving groups include, but are not limited to, halogen, alkane- or arylenesulfonyloxy, such as methanesulfonyloxy, ethanesulfonyloxy, thiomethyl, benzenesulfonyloxy, tosyloxy, and thienyloxy, dihalophosphinoyloxy, optionally substituted benzyloxy, isopropyloxy, acyloxy, and the like. In some embodiments, a leaving group can be HC(0)-COOH or RC(0)-COOH, wherein R
is a C1-C6 alkyl or substituted Ci-C6 alkyl.
is a C1-C6 alkyl or substituted Ci-C6 alkyl.
[00103] The compounds of the invention as described herein may be synthesized using standard synthetic techniques known to those of skill in the art or using methods known in the art in combination with methods described herein. The starting materials used for the synthesis of the compounds of the invention as described herein, can be obtained from commercial sources, such as Aldrich Chemical Co. (Milwaukee, Wis.), Sigma Chemical Co. (St. Louis, Mo.), or the starting materials can be synthesized. The compounds described herein, and other related compounds having different substituents can be synthesized using techniques and materials known to those of skill in the art, such as described, for example, in March, Advanced Organic Chemistry 4th Ed. (1992) John Wiley & Sons, New York, N.Y.; Carey and Sundberg, Advanced Organic Chemistry 4th Ed., Vols. A (2000) and B (2001) Plenum Press, New York, N.Y. and Greene and Wuts, Protective Groups in Organic Synthesis, 3rd Ed. (1999) John Wiley & Sons, =
New York, N.Y. General methods for the preparation of compound as disclosed herein may be derived from known reactions in the field, and the reactions may be modified by the use of appropriate reagents and conditions, as would be recognized by the skilled person, for the introduction of the various moieties found in the formulae as provided herein. For example, the compounds described herein can be modified using various electrophiles or nucleophiles to form new functional groups or substituents.
New York, N.Y. General methods for the preparation of compound as disclosed herein may be derived from known reactions in the field, and the reactions may be modified by the use of appropriate reagents and conditions, as would be recognized by the skilled person, for the introduction of the various moieties found in the formulae as provided herein. For example, the compounds described herein can be modified using various electrophiles or nucleophiles to form new functional groups or substituents.
[00104] In one aspect, provided is an antimicrobial compound having a structure of formula (A): RA - LA - G - LB - RB (A), wherein each of RA and RB is independently a radical comprising an oxaborole moiety;
R R
¨A¨
each of LA and LB is independently -0-, ¨N¨, ¨B¨ ¨P¨, or R' ;
each of R and R' is independently hydrogen, unsubstituted or substituted C1-18 -alkyl, arylalkyl, aryl, or heterocyclic moiety; and G is a substituted or unsubstituted C1_18 -alkylene, arylalkylene, arylene, or heterocyclic moiety.
R R
¨A¨
each of LA and LB is independently -0-, ¨N¨, ¨B¨ ¨P¨, or R' ;
each of R and R' is independently hydrogen, unsubstituted or substituted C1-18 -alkyl, arylalkyl, aryl, or heterocyclic moiety; and G is a substituted or unsubstituted C1_18 -alkylene, arylalkylene, arylene, or heterocyclic moiety.
[00105] In one embodiment, the antimicrobial compound is a volatile compound.
In another embodiment, the - LA G - LB - portion of formula (A) is derived from a diol or diamine compound. In a further embodiment, the diol compound is selected from the group consisting of 1,2-ethylene glycol; 1,2-propylene glycol; 1,3-propylene glycol; 1,1,2,2-tetramethy1-1,2-ethylene glycol; 2,2-dimethy1-1,3-propylene glycol; 1,6-hexanediol; 1,10-decanediol;
and combinations thereof. In another embodiment, the diamine compound is 1,2-ethylene diamine;
1,3-propylene diamine; or combinations thereof. In another embodiment, LA and LB are identical. In another embodiment, LA and LB are different. In another embodiment, each of LA and LB
is independently -0- or -NH-. In another embodiment, LA and LB are identical. In another embodiment, LA and LB are different. In another embodiment, G is a substituted or =substituted C1_8-alkylene. In a further embodiment, G is a substituted or unsubstituted C1-4 -alkylene. In a further embodiment, G is selected from -CH2-, -CH2-CH2-, and -CH2-CH2-CH2-.
In another embodiment, the - LA G - LB - portion of formula (A) is derived from a diol or diamine compound. In a further embodiment, the diol compound is selected from the group consisting of 1,2-ethylene glycol; 1,2-propylene glycol; 1,3-propylene glycol; 1,1,2,2-tetramethy1-1,2-ethylene glycol; 2,2-dimethy1-1,3-propylene glycol; 1,6-hexanediol; 1,10-decanediol;
and combinations thereof. In another embodiment, the diamine compound is 1,2-ethylene diamine;
1,3-propylene diamine; or combinations thereof. In another embodiment, LA and LB are identical. In another embodiment, LA and LB are different. In another embodiment, each of LA and LB
is independently -0- or -NH-. In another embodiment, LA and LB are identical. In another embodiment, LA and LB are different. In another embodiment, G is a substituted or =substituted C1_8-alkylene. In a further embodiment, G is a substituted or unsubstituted C1-4 -alkylene. In a further embodiment, G is selected from -CH2-, -CH2-CH2-, and -CH2-CH2-CH2-.
[00106] In another embodiment, each of RA and le is independently derived from the group consisting of 5-fluoro-1,3-dihydro-1-hydroxy-2,1-berizoxaborole; 5-claloro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole; 1,3-dihydro-1-hydroxy-2,1-benzoxaborole; and combinations thereof. In another embodiment, RA and RB are identical. In another embodiment, RA and RE1 are different.
[00107] In another embodiment, at least one of RA and RB is selected from formula (B), (C), or (D):
/
/ / - , B-0 ,R1J I
0 1r --- _ C-Rli, q2 ..------,--,..,-- B, m---------- el i\
1, , , Re R qi I it, R- R
, (11 PR' R2 q 1 ' (C), o; (D)
/
/ / - , B-0 ,R1J I
0 1r --- _ C-Rli, q2 ..------,--,..,-- B, m---------- el i\
1, , , Re R qi I it, R- R
, (11 PR' R2 q 1 ' (C), o; (D)
[00108] wherein ql and q2 are independently 1, 2, or 3;
[00109] q3 = 0, 1, 2, 3, or 4;
[00110] B is boron;
[00111] M is hydrogen, halogen, -OCH3, or -CH2-0-CH2-0-CH3;
[00112] A41 is halogen, -CH2OH, or -OCH3;
[00113] X is 0, S, or NRic, wherein Ric is hydrogen, substituted alkyl, or unsubstituted alkyl;
[00114] R1, Ria, Rib, -25 K and R5 are independently hydrogen, OH, NH2, SH, CN, NO2, SO2, 0S020H, OSO2NH2, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl;
[00115] and agriculturally acceptable salts thereof.
[00116] Additional oxaborole moieties are also disclosed previously in U.S.
Patent No.
8,106,031, and International Patent Application WO 2007/13 1072A2, the contents of which are hereby incorporated by reference in their entireties.
Patent No.
8,106,031, and International Patent Application WO 2007/13 1072A2, the contents of which are hereby incorporated by reference in their entireties.
[00117] In another embodiment, at least one of RA and RB has a structure of formula (F):
D /
..."-.......___.....-B
1 \
(F)
D /
..."-.......___.....-B
1 \
(F)
[00118] wherein A and D together with the carbon atoms to which they are attached form a 5, 6, or 7-membered fused ring which may be substituted by Ci_6 -alkyl, Ci_6 -alkoxy, hydroxy, halogen, nitro, nitrile, amino, amino substituted by one or more Ci_6 -alkyl groups, carboxy, acyl, aryloxy, carbonamido, carbonamido substituted by Ci_6 -alkyl, sulphonamido or trifluoromethyl or the fused ring may link two oxaborole rings; B is boron;
[00119] Xl is a group ¨CR7R8 wherein R7 and R8 are each independently hydrogen, C1-6 -alkyl, nitrile, nitro, aryl, aralkyl or R7 and R8 together with the carbon atom to which they are attached form an alicyclic ring; and
[00120] and agriculturally acceptable salts thereof.
[00121] Additional oxaborole moieties are also disclosed previously in U.S.
Patent No.
5,880,188, the content of which is hereby incorporated by reference in its entirety.
Patent No.
5,880,188, the content of which is hereby incorporated by reference in its entirety.
[00122] In another embodiment, at least one of RA and RB is selected from formula (E) or (G):
/
e.......--B\
R6(n) /0 X2 (E)
/
e.......--B\
R6(n) /0 X2 (E)
[00123] wherein each R6 is independently hydrogen, alkyl, alkene, alkyne, haloalkyl, haloalkene, haloalkyne, alkoxy, alkeneoxy, haloalkoxy, aryl, heteroaryl, arylalkyl, arylalkene, arylalkyne, heteroarylalkyl, heteroarylalkene, heteroarylalkyne, halogen, hydroxyl, nitrile, amine, ester, carboxylic acid, ketone, alcohol, sufide, sulfoxide, sulfone, sulfoximine, sulfilimine, sulfonamide, sulfate, sulfonate, nitroalkyl, amide, oxime, imine, hydroxylamine, hydrazine, hydrazone, carbamate, thiocarbamate, urea, thiourea, carbonate, aryloxy, or heteroaryloxy;
[00124] n= 1, 2, 3, or 4;
[00125] B is boron;
[00126] X2 = (CR62)m where m = 1, 2, 3, or 4; or
[00127]
B\
R'-I 10 \O
x3/\
0 (G)
B\
R'-I 10 \O
x3/\
0 (G)
[00128] wherein R9 is CN, C(0)NR11R12, or C(0)0R13 wherein R13 is hydrogen, substituted alkyl, or unsubstituted alkyl,
[00129] X3 is N, CH and CR1 ;
[00130] R1 is halogen, substituted or unsubstituted alkyl, C(0)R14, C(0)0R14, OR14, NR14R15, wherein each of R", R12, R14, and R15 is independently hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl;
[00131] and agriculturally acceptable salts thereof.
[00132] In a further embodiment when at least one of RA and RB has a structure of formula (G), R9 is NC and RI-9 is Rb.
[00133] In another embodiment, at least one of RA and RB has a structure selected from:
" y-----,...õ,õ -....e0,---,.....;..- -.., R' 1 \
/..-L,....
,4,-" - ,,,-4,.. f N''''' , Or 0 .
" y-----,...õ,õ -....e0,---,.....;..- -.., R' 1 \
/..-L,....
,4,-" - ,,,-4,.. f N''''' , Or 0 .
[00134] In another embodiment, at least one of RA and RB has a structure selected from:
I, r 11 cl Or .
I, r 11 cl Or .
[00135] In another embodiment, at least one of RA and RB has a structure selected from:
, le =-,,,,,,.... --,-;,.... N
;==;
p :
NC i ;
1'µa 0 /
-"----,1 i e Or l .
, le =-,,,,,,.... --,-;,.... N
;==;
p :
NC i ;
1'µa 0 /
-"----,1 i e Or l .
[00136] In another embodiment when at least one of RA and RB has a structure of formula (G), R9 is ¨COOR3 and RI- is Rb.
[00137] In another embodiment, at least one of RA and RB has a structure selected from:
.,4.1 \ [0(xx:'`N\e-- ,,,,r-,,,,--..;-e"'=-,,,,r,,,,R\
. :=.1 L.) $.'---- \
k R' ----4- :
Or 0 .
.,4.1 \ [0(xx:'`N\e-- ,,,,r-,,,,--..;-e"'=-,,,,r,,,,R\
. :=.1 L.) $.'---- \
k R' ----4- :
Or 0 .
[00138] In another embodiment, at least one of RA and RB has a structure selected from:
i '-...õõ,......- --sk,.,,, .,;=",-,õ,,,,,,,õ....- \ -....õ,õ7----N,,,, i.t 1 1 o 0 \
Or .
i '-...õõ,......- --sk,.,,, .,;=",-,õ,,,,,,,õ....- \ -....õ,õ7----N,,,, i.t 1 1 o 0 \
Or .
[00139] In another embodiment, at least one of RA and RB has a structure selected from:
/ 3000C i ..,,,,,,,,õ..,..õ..".1.\dX}R-' ...õ,..it ,,,..õ....
..,,,,,,,..,..,, efs,-,#."'"-=..,..õ,_.---1) \
N
''&
_ 1 r "----, ..7.--,, ,-----------, =,.1.-.4Ø, , le N 0 N
\
111 i P
le"
Or le .
/ 3000C i ..,,,,,,,,õ..,..õ..".1.\dX}R-' ...õ,..it ,,,..õ....
..,,,,,,,..,..,, efs,-,#."'"-=..,..õ,_.---1) \
N
''&
_ 1 r "----, ..7.--,, ,-----------, =,.1.-.4Ø, , le N 0 N
\
111 i P
le"
Or le .
[00140] In another embodiment when at least one of RA and RB has a structure of formula (G), R9 is ¨CONR1R2 and RI- is Rip.
[00141] In another embodiment, the volatile antimicrobial compound of the invention is selected from:
=CON11111.-' CONWR7'.
re.o.',' ......---1 .,-"'''''''''"--..
\ !I I \
0 kT I C) ,..---"'' /
.,,-"Ny....."1"--fe---",..r..-.1_11_, 'o ,and .
=CON11111.-' CONWR7'.
re.o.',' ......---1 .,-"'''''''''"--..
\ !I I \
0 kT I C) ,..---"'' /
.,,-"Ny....."1"--fe---",..r..-.1_11_, 'o ,and .
[00142] In another embodiment, the volatile antimicrobial compound of the invention is selected from:
coNg'W / coNR.Ir? /
'''''N,,,õ.....' 'N.,, ..,..õ..."' , õ-.- A ....*N., sN,õ..
,,,..F"-..,,,,,,,,,...=
k \ $ [ \
0 i and .
coNg'W / coNR.Ir? /
'''''N,,,õ.....' 'N.,, ..,..õ..."' , õ-.- A ....*N., sN,õ..
,,,..F"-..,,,,,,,,,...=
k \ $ [ \
0 i and .
[00143] In another embodiment, the volatile antimicrobial compound of the invention is selected from:
C..x..)IN feR2 Fee / (...()Xilik /
.N
r'-e. '''7' ..4..õ----- , _,-.1.1 11 \
1,I
L'Ns..._., 9 , CON it I it= / C.ONT'kt J ..-! i ''',.1/4..,'-''''' : ,,,,,,,,,,..--= .,:.. õ,.....-, 13 ,,,,, '1/4..õ, ..,,,,, .õõ.... e....01:-.P-...,),..õ, 11 i ..t !,..- -.... N.....-"' -,... cy....-- "".---.;,,.......
N
()Nit ' P.::` /
( 1 ."1õ, ....,,,--"
and .
C..x..)IN feR2 Fee / (...()Xilik /
.N
r'-e. '''7' ..4..õ----- , _,-.1.1 11 \
1,I
L'Ns..._., 9 , CON it I it= / C.ONT'kt J ..-! i ''',.1/4..,'-''''' : ,,,,,,,,,,..--= .,:.. õ,.....-, 13 ,,,,, '1/4..õ, ..,,,,, .õõ.... e....01:-.P-...,),..õ, 11 i ..t !,..- -.... N.....-"' -,... cy....-- "".---.;,,.......
N
()Nit ' P.::` /
( 1 ."1õ, ....,,,--"
and .
[00144] In one embodiment, Rb is selected from fluorine and chlorine. In another embodiment, R
b is selected from 0R2 and NR21R22. In another embodiment when Rip is OR20 , R2 is selected from H, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl, and substituted or unsubstituted heteroaryl.
In another embodiment when Rb is 0K''20, R2o is selected from H, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl and substituted or unsubstituted cycloalkyl. In another embodiment when Rb is 5 0¨K20 0 R2 is unsubstituted Ci_6 alkyl. In another embodiment when Rb is OR20, R2 is unsubstituted cycloalkyl. In another embodiment when Rip is 0R205 R20 is alkyl, substituted with a member selected from substituted or unsubstituted C1-6 alkoxy. In another embodiment when Rb is 0K''205 R2o is alkyl, substituted with at least one halogen. In another embodiment when Rb 0K''205 R2o is alkyl, substituted with at least one oxo moiety.
b is selected from 0R2 and NR21R22. In another embodiment when Rip is OR20 , R2 is selected from H, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl, and substituted or unsubstituted heteroaryl.
In another embodiment when Rb is 0K''20, R2o is selected from H, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl and substituted or unsubstituted cycloalkyl. In another embodiment when Rb is 5 0¨K20 0 R2 is unsubstituted Ci_6 alkyl. In another embodiment when Rb is OR20, R2 is unsubstituted cycloalkyl. In another embodiment when Rip is 0R205 R20 is alkyl, substituted with a member selected from substituted or unsubstituted C1-6 alkoxy. In another embodiment when Rb is 0K''205 R2o is alkyl, substituted with at least one halogen. In another embodiment when Rb 0K''205 R2o is alkyl, substituted with at least one oxo moiety.
[00145] In another embodiment when Rb is 0-20 R2 is a member selected from -CH3, -CH2CH3, -(CH2)2CH3, -CH(CH3)2, -CH2CF3, -CH2CHF2, -CH2CH2(OH), -CH2CH2(OCH3), -CH2CH2(0C(CH3)2), -C(0)CH3, -CH2CH20C(0)CH3, -CH2C(0)0CH2CH35 -CH2C(0)0C(CH3)3, -(CH2)3C(0)CH3, -CH2C(0)0C(CH3)3, cyclopentyl, cyclohexyl, s '1) <c- 5 ---- 5 and
[00146] In another embodiment when Rb is NR21R225 R21 and ¨22 are members independently selected from H, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl, and substituted or unsubstituted heteroaryl. In another embodiment when Rb is NR21R225 ¨21 K is H or unsubstituted alkyl; and R22 is unsubstituted alkyl or alkyl substituted with a member selected from hydroxyl, phenyl, unsubstituted alkoxy and alkoxy substituted with a phenyl. In a further embodiment when Rb is NR21R225 ¨21 is H or CH3.
[00147] In another embodiment when Rb is NR21R225 R21 and ¨22 are independently selected from substituted or unsubstituted alkyl. In another embodiment when Rb is NR21R225 R21 is unsubstituted alkyl; and R22 is substituted or unsubstituted alkyl. In another embodiment when Rb is NR21R225 R2' is unsubstituted alkyl; and R22 is alkyl, substituted with a member selected from substituted or unsubstituted alkoxy and hydroxyl. In another embodiment when Rb is NR21R225 ¨21 K is unsubstituted alkyl; and R22 is alkyl, substituted with unsubstituted alkoxy. In another embodiment when Rb is NR21R225 ¨21 K is unsubstituted alkyl; and R22 is alkyl, substituted with alkoxy, substituted with phenyl. In another embodiment when Rb is NR21R225 R21 is =substituted alkyl; and R22 is alkyl, substituted with unsubstituted alkoxy.
In another embodiment when Rb is NR21R22, R21 an ¨ lc 22 a together with the nitrogen to which they are attached, are combined to form a 4- to 8-membered substituted or =substituted heterocydoalkyl ring. In another embodiment when Rb is NR21R22, R21 and R22 together with the nitrogen to which they are attached, are combined to form a 5- or 6-membered substituted or =substituted heterocycloalkyl ring.
In another embodiment when Rb is NR21R22, R21 an ¨ lc 22 a together with the nitrogen to which they are attached, are combined to form a 4- to 8-membered substituted or =substituted heterocydoalkyl ring. In another embodiment when Rb is NR21R22, R21 and R22 together with the nitrogen to which they are attached, are combined to form a 5- or 6-membered substituted or =substituted heterocycloalkyl ring.
[00148] In another embodiment, R" .is selected from N(CH3)2, N(CH3)(CH2CH2(OCH3)), N(CH3)(CH2C112011), NH2, NHCH3, NH(CH2CH2(OCH3)), NH(CH2CH2(OCH2Ph), NH(CH2Ph), NH(C(CH3)3) and NH(CH2CH2OH). In another embodiment, Rb is selected from ), Cl\a', and r2i .
[00149]
Additional oxaborole moieties are also disclosed previously in U.S. patent No.
8,039,450, and patent application publication US 2009/0291917.
Additional oxaborole moieties are also disclosed previously in U.S. patent No.
8,039,450, and patent application publication US 2009/0291917.
[00150] In another embodiment, the antimicrobial compound has a structure of formula (Al) or (A2):
0 '0 D1 A1 0 0 Al (Al) NN G"1\1/ D2 D
\() (A2) /001511 wherein each of Al, A2, D1, and D2 is independently hydrogen, substituted or unsubstituted C1-18 -alkyl, arylalkyl, aryl, or heterocyclic; or Al and DI, or A2 and D2 together form a 5, 6, or 7-membered fused ring which is substituted or unsubstituted;
[00152] each of R16, R175 R18, and R19 is independently hydrogen, substituted or unsubstituted C1_6 -alkyl, nitrile, nitro, aryl or aryl alkyl; or R16 and R17, or R18 and R19 together form an alicyclic ring which is substituted or unsubstituted;
[00153] B is boron; and [00154] G is a substituted or unsubstituted C118 -alkylene, arylalkylene, arylene, or heterocyclic moiety.
[00155] In another embodiment, each of RA and RB is independently B B
\ \
F x2 10 x2 Or wherein X2 = (CR62)m and m = 1, 2, 3, or 4.
[00156] In another embodiment, each of RA and RB is independently / /
BOB\
or 0 \
F Or .
[00157] In another embodiment, the antimicrobial compound has the structure of /0 ________________________________ \
0 B\ ___________________________________ \
F.
[00158] The practice of the present invention involves the use of one or more cyclopropene compound. As used herein, a cyclopropene compound is any compound with the formula where each Rl, R2, R3 and R4 is independently selected from the group consisting of H and a chemical group of the formula:
where n is an integer from 0 to 12. Each L is a bivalent radical. Suitable L
groups include, for example, radicals containing one or more atoms selected from H, B, C, N, 0, P, S, Si, or mixtures thereof The atoms within an L group may be connected to each other by single bonds, double bonds, triple bonds, or mixtures thereof Each L group may be linear, branched, cyclic, or a combination thereof. In any one R group (i.e., any one of Rl, R2, R3 and R4) the total number of heteroatoms (i.e., atoms that are neither H nor C) is from 0 to 6.
Independently, in any one R group the total number of non-hydrogen atoms is 50 or less. Each Z
is a monovalent radical. Each Z is independently selected from the group consisting of hydrogen, halo, cyano, nitro, nitroso, azido, chlorate, bromate, iodate, isocyanato, isocyanido, isothiocyanato, pentafluorothio, and a chemical group G, wherein G is a 3 to 14 membered ring system.
[00159] The Rl, R2, R3, and R4 groups are independently selected from the suitable groups.
Among the groups that are suitable for use as one or more of Rl, R2, R3, and R4 are, for example, aliphatic groups, aliphatic-oxy groups, alkylphosphonato groups, cycloaliphatic groups, cycloalkylsulfonyl groups, cycloalkylamino groups, heterocyclic groups, aryl groups, heteroaryl groups, halogens, silyl groups, other groups, and mixtures and combinations thereof Groups that are suitable for use as one or more of Rl, R2, R3, and R4 may be substituted or unsubstituted.
[00160] Among the suitable Rl, R2, R3, and R4 groups are, for example, aliphatic groups.
Some suitable aliphatic groups include, for example, alkyl, alkenyl, and alkynyl groups. Suitable aliphatic groups may be linear, branched, cyclic, or a combination thereof.
Independently, suitable aliphatic groups may be substituted or unsubstituted.
[00161] As used herein, a chemical group of interest is said to be "substituted" if one or more hydrogen atoms of the chemical group of interest is replaced by a substituent.
[00162] Also among the suitable Rl, R2, R3, and R4 groups are, for example, substituted and unsubstituted heterocyclyl groups that are connected to the cyclopropene compound through an intervening oxy group, amino group, carbonyl group, or sulfonyl group;
examples of such Rl, R2, R3, and R4 groups are heterocyclyloxy, heterocyclylcarbonyl, diheterocyclylamino, and diheterocyclylaminosulfonyl.
[00163] Also among the suitable Rl, R2, R3, and R4 groups are, for example, substituted and unsubstituted heterocyclic groups that are connected to the cyclopropene compound through an intervening oxy group, amino group, carbonyl group, sulfonyl group, thioalkyl group, or aminosulfonyl group; examples of such Rl, R2, R3, and R4 groups are diheteroarylamino, heteroarylthioalkyl, and diheteroarylaminosulfonyl.
[00164] Also among the suitable Rl, R2, R3, and R4 groups are, for example, hydrogen, fluoro, chloro, bromo, iodo, cyano, nitro, nitroso, azido, chlorato, bromato, iodato, isocyanato, isocyanido, isothiocyanato, pentafluorothio; acetoxy, carboethoxy, cyanato, nitrato, nitrito, perchlorato, allenyl, butylmercapto, diethylphosphonato, dimethylphenylsilyl, isoquinolyl, mercapto, naphthyl, phenoxy, phenyl, piperidino, pyridyl, quinolyl, triethylsilyl, trimethylsilyl;
and substituted analogs thereof [00165] As used herein, the chemical group G is a 3 to 14 membered ring system. Ring systems suitable as chemical group G may be substituted or unsubstituted; they may be aromatic (including, for example, phenyl and napthyl) or aliphatic (including unsaturated aliphatic, partially saturated aliphatic, or saturated aliphatic); and they may be carbocyclic or heterocyclic.
Among heterocyclic G groups, some suitable heteroatoms are, for example, nitrogen, sulfur, oxygen, and combinations thereof. Ring systems suitable as chemical group G
may be monocyclic, bicyclic, tricyclic, polycyclic, spiro, or fused; among suitable chemical group G ring systems that are bicyclic, tricyclic, or fused, the various rings in a single chemical group G may be all the same type or may be of two or more types (for example, an aromatic ring may be fused with an aliphatic ring).
[00166] In one embodiment, one or more of Rl, R2, R3, and R4 is hydrogen or (C1-C10) alkyl.
In another embodiment, each of Rl, R2, R3, and R4 is hydrogen or (Ci-C8) alkyl. In another embodiment, each of Rl, R2, R3, and R4 is hydrogen or (C1-C4) alkyl. In another embodiment, each of Rl, R2, R3, and R4 is hydrogen or methyl. In another embodiment, Rl is (C1-C4) alkyl and each of R2, R3, and R4 is hydrogen. In another embodiment, Rl is methyl and each of R2, R3, and R4 is hydrogen, and the cyclopropene compound is known herein as 1-methylcyclopropene or "1-MCP."
[00167] In another embodiment, the cyclopropene is of the formula:
wherein R is a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, phenyl, or naphthyl group; wherein the substituents are independently halogen, alkoxy, or substituted or unsubstituted phenoxy. In one embodiment, R is C1_8 alkyl. In another embodiment, R is methyl.
[00168] In another embodiment, the cyclopropene is of the formula:
wherein Rl is a substituted or unsubstituted Ci-C4 alkyl, Ci-C4 alkenyl, Ci-C4 alkynyl, Ci-C4 cylcoalkyl, cylcoalkylalkyl, phenyl, or napthyl group; and R2, R3, and R4 are hydrogen. In another embodiment, the cyclopropene comprises 1-methylcyclopropene (1-MCP).
[00169] As used herein, the phrase "transgene vector" refers to a vector that contains an inserted segment of DNA, the "transgene" that is transcribed into mRNA or replicated as RNA
within a host cell. The phrase "transgene" refers not only to that portion of inserted DNA that is converted into RNA, but also those portions of the vector that are necessary for the transcription or replication of the RNA. A transgene typically comprises a gene-of-interest but needs not necessarily comprise a polynucleotide sequence that contains an open reading frame capable of producing a protein.
[00170] Meats, plants, or plant parts may be treated in the practice of the present invention.
One example is treatment of whole plants; another example is treatment of whole plants while they are planted in soil, prior to the harvesting of useful plant parts.
[00171] Any plants that provide useful plant parts may be treated in the practice of the present invention. Examples include plants that provide fruits, vegetables, and grains.
[00172] As used herein, the phrase "plant" includes dicotyledons plants and monocotyledons plants. Examples of dicotyledons plants include tobacco, Arabidopsis, soybean, tomato, papaya, canola, sunflower, cotton, alfalfa, potato, grapevine, pigeon pea, pea, Brassica, chickpea, sugar beet, rapeseed, watermelon, melon, pepper, peanut, pumpkin, radish, spinach, squash, broccoli, cabbage, carrot, cauliflower, celery, Chinese cabbage, cucumber, eggplant, and lettuce.
Examples of monocotyledons plants include corn, rice, wheat, sugarcane, barley, rye, sorghum, orchids, bamboo, banana, cattails, lilies, oat, onion, millet, and triticale.
Examples of fruit include banana, pineapple, oranges, grapes, grapefruit, watermelon, melon, apples, peaches, pears, kiwifruit, mango, nectarines, guava, persimmon, avocado, lemon, fig, and berries.
[00173] Those skilled in the art would understand certain variation can exist based on the disclosure provided. Thus, the following examples are given for the purpose of illustrating the invention and shall not be construed as being a limitation on the scope of the invention or claims.
EXAMPLES
Example 1 ¨ Preparation of Sample 1 [00174] 3.20 g of 5-fluoro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole (21.2 mmol) and 3.20 g of ethylene glycol (51.6 mmol) are heated in 40 g of toluene. The toluene water azeotrope is distilled out of the system until the head temperature reached 110 C. The toluene is removed via rotary evaporator and the excess ethylene glycol is removed by kugelrohr distillation at about 20 torr and 100 C bath temperature. Recrystallization from toluene generates 2.95 g of white crystals, mp 145-149 C. Proton nmr shows spectra and integration consistent with the two to one product below:
\
F 0 \ __________________________________ O)B
Example 2 ¨ Preparation of Sample 2 [00175] 3.00 g of 1,3-dihydro-1-hydroxy-2,1-benzoxaborole (22.4 mmol) and 3.00 g of ethylene glycol (46.9 mmol) are heated in 40 g of toluene. The toluene water azeotrope is distilled out of the system until the head temperature reached 110 C. The toluene is removed via rotary evaporator and the excess ethylene glycol is removed by kugelrohr distillation at about 20 torr and 100 C bath temperature. Recrystallization from toluene generates 2.49 g of white crystals, mp 118 ¨ 120.5 C. Proton NMR shows spectra and integration consistent with the two to one product.
Example 3 ¨ Preparation of Sample 3 [00176] 3.17 g of 5-fluoro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole (21.0 mmol) and 3.22 g of pinacol (27.3 mmol) are heated in 40 g of toluene. The toluene water azeotrope is distilled out of the system until the head temperature reached 110 C. The toluene is removed via rotary evaporator and the excess pinacol is removed by kugelrohr distillation at about 20 ton and 120 C bath temperature. Recrystallization from hexane generatese 3.21 g of white crystals, mp 81-89 C. Proton NMR shows spectra and integration consistent with the two to one product.
Example 4 ¨ Preparation of Sample 4 [00177] 3.0 g of 5-fluoro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole (19.9 mmol) and 2.5 g of 1,2-propanediol (propylene glycol; 32.9 mmol) are heated in 40 g of toluene.
The toluene water azeotrope is distilled out of the system until the head temperature reached 110 C. The toluene is removed via rotary evaporator and the excess propylene glycol is removed by kugelrohr distillation at about 20 ton and 110 C bath temperature. Recrystallization from hexane generates 3.49 g of white crystals, mp 65.5-68.5 C. Proton NMR shows spectra and integration consistent with the two to one product.
Example 5 - In Vitro Analysis [00178] 12-well (7 ml volume per well) microtiter plates are used for the in vitro inhibition assay for volatile antimicrobial compounds. A 3-ml volume of full-strength Potato Dextrose Agar (PDA) is added to each well. After cooling, 1 iut of 1 x 106 per ml Botrytis cinerea spore suspension is spot pipette to the centre of the agar. For the first experiment, inoculated plates are allowed to germinate for 5 days at 4 C. For the second experiment, plates are inoculated immediately prior to volatile fungicide treatment. Small Whatman #1 filter disks (Cat. No.
1001-0155) are placed, in duplicate, on the underside of a polyethylene PCR
plate sealing film.
For determination of the minimum inhibitory concentration (MIC), test compounds are diluted in acetone, and the appropriate amount of compound is added to disks in a dose dependent manner (1.25 to 0.0006 mg/disk).
Table 1. Antimicrobial activities of Samples 1-4 MIC mg/1 BOT
ID RCI PENIEX ALTEAL MONIFR GLOMCI
Sample 1 <0.6 8.9 2.2 --- ---Sample 2 <0.6 8.9 8.9 35.7 142.9 Sample 3 <0.6 4.5 2.2 --- ---Sample 4 <0.6 8.9 1.1 --- ---[00179] The acetone is permitted to evaporate for 5 minutes. The headspace around the Botrytis cinerea inoculum is then sealed inside the well by the film with the adhering disk containing the fungicide. Plates are inverted, placed over the treated disks and sealed to prevent any of the chemical from flakin from the disk and falling onto the inoculated agar. After 14 days of storage at 4 C, cultures are evaluated for percent growth relative to control. Regardless of whether the spores had germinated for 5 days, or if the treatment commenced soon after inoculation of the plates (-15 minutes); there is 100% control of the fungal pathogen down to 0.005 mg. Samples 1-4 show good antimicrobial activity against Botrytis and/or other pathogens in this in vitro analysis. Minimum inhibitory concentrations (MIC) are shown in Tables 1 and 2 for results from two separate tests.
Table 2. Antimicrobial activities of Samples 1-4 (repeat test) MIC mg/1 BOT
ID RCI PENIEX ALTEAL MONIFR GLOMCI
Sample 1 0.6 --- >2.2 2.2 ---Sample 2 2.2 8.9 --- --- ---Sample 3 1.1 --- >2.2 1.1 ---Sample 4 0.6 --- >2.2 1.1 ---Example 6 ¨ Grape In Vivo Analysis [00180] In order to assess the in vivo activity of volatile antimicrobial compounds, a volatile bioassay is developed using green table grape. Fruit are placed individually inside a 20 ml scintillation vial, with the stem wound facing upwards. The fresh stem wound is inoculated with iut of 1 x 106 per ml Botrytis cinerea spore suspension. Whatman filter paper (Cat. No.
1822-024) is placed inside duplicate vial caps. For determination of the MIC, test compounds are diluted in acetone, and the appropriate amount of compound is added to disks in a dose dependent manner (for example 2.5 to 0.0024 mg/disk). The acetone is permitted to evaporate for 5 minutes. The vials are then capped with the lids containing the fungicide, and placed for 14 days at 4 C. After storage, fruit are evaluated for incidence of disease and appearance of phytotoxicity. Samples 1-4 show good antimicrobial activity against Botrytis in this in vivo analysis.
Example 7¨ Strawberry In Vivo Analysis [00181] In order to assess the in vivo activity of volatile antimicrobial compounds, a volatile bioassay is developed using strawberry. Two fruit are placed inside a 240 ml jar, with the calyx facing downwards. A fresh wound is inoculated with 20 iut of 1 x 106 per ml Botrytis cinerea spore suspension. Whatman filter paper (Cat. No. 1822-024) is placed inside duplicate jar lids.
For determination of the MIC, test compounds are diluted in acetone, and the appropriate amount of compound is added to disks in a dose dependent manner (for example 2.5 to 0.005 mg/disk).
The acetone is permitted to evaporate for 5 minutes. The jars are then capped with the lids containing the fungicide, and placed for 5 days at 21 C. After storage, fruit are evaluated for incidence and severity of disease and appearance of phytotoxicity. Samples 1-4 show good antimicrobial activity against Botrytis in this in vivo analysis.
Example 8 - Additional Strawberry In Vivo Analysis [00182] In order to assess the in vivo dose by time activity of volatile antimicrobial compounds, a volatile bioassay is developed using strawberry. Two fruit are placed inside a 240 ml jar, with the calyx facing downwards. A fresh wound is inoculated with 20 iut of 1 x 106 per ml Botrytis cinerea spore suspension. Whatman filter paper (Cat. No. 1822-024) is placed inside duplicate jar lids. Test samples are diluted in acetone, and the appropriate amount of compound is added to disks for example at two rates 0.008 or 0.125 mg. The acetone is permitted to evaporate for 5 minutes. The jars are capped with the lids containing the fungicide, and incubated with the volatile fungicide for 1, 3, 6, 24 or 72 hours. After incubation, lids containing the disk with test compounds are replaced with new lids without test compounds. All samples are maintained at 21 C for 3 days, then lids are removed and maintained for an additional 48 hours, all at 90% R.H. Fruit are evaluated for incidence and severity of disease and appearance of phytotoxicity. Samples 1-4 show good antimicrobial activity against Botrytis in this in vivo analysis.
Example 9 ¨ Antimicrobial Activity Against Bacteria [00183] 12-well (7 ml volume per well) microtiter plates are used for the in vitro inhibition assay for volatile antimicrobial compounds. A 3-ml volume of full-strength LB
Agar is added to each well. After cooling, 15 iut of Escherichia coli, adjusted to an optical density of 0.02 to 0.035, and further diluted 1/10 is pipette to the centre of the agar and tilted to distribute uniformly. Small Whatman #1 filter disks (Cat. No. 1001-0155) are placed, in duplicate, on the underside of a polyethylene PCR plate sealing film. For determination of the minimum inhibitory concentration (MIC), test compounds are diluted in acetone, and 5 mg of compound is added to disks. The acetone is permitted to evaporate for 5 minutes. The headspace around the Escherichia coli inoculum is then sealed inside the well by the film with the adhering disk containing the fungicide. Plates are inverted, placed over the treated disks and sealed to prevent any of the chemical from flaking from the disk and falling onto the inoculated agar. After 3 days of storage at 4 C, cultures are transferred to 23 C for an additional 2 days, and then evaluated for colony growth relative to control. Samples 1-4 show good antimicrobial activity against Escherichia coli in this in vitro analysis.
0 '0 D1 A1 0 0 Al (Al) NN G"1\1/ D2 D
\() (A2) /001511 wherein each of Al, A2, D1, and D2 is independently hydrogen, substituted or unsubstituted C1-18 -alkyl, arylalkyl, aryl, or heterocyclic; or Al and DI, or A2 and D2 together form a 5, 6, or 7-membered fused ring which is substituted or unsubstituted;
[00152] each of R16, R175 R18, and R19 is independently hydrogen, substituted or unsubstituted C1_6 -alkyl, nitrile, nitro, aryl or aryl alkyl; or R16 and R17, or R18 and R19 together form an alicyclic ring which is substituted or unsubstituted;
[00153] B is boron; and [00154] G is a substituted or unsubstituted C118 -alkylene, arylalkylene, arylene, or heterocyclic moiety.
[00155] In another embodiment, each of RA and RB is independently B B
\ \
F x2 10 x2 Or wherein X2 = (CR62)m and m = 1, 2, 3, or 4.
[00156] In another embodiment, each of RA and RB is independently / /
BOB\
or 0 \
F Or .
[00157] In another embodiment, the antimicrobial compound has the structure of /0 ________________________________ \
0 B\ ___________________________________ \
F.
[00158] The practice of the present invention involves the use of one or more cyclopropene compound. As used herein, a cyclopropene compound is any compound with the formula where each Rl, R2, R3 and R4 is independently selected from the group consisting of H and a chemical group of the formula:
where n is an integer from 0 to 12. Each L is a bivalent radical. Suitable L
groups include, for example, radicals containing one or more atoms selected from H, B, C, N, 0, P, S, Si, or mixtures thereof The atoms within an L group may be connected to each other by single bonds, double bonds, triple bonds, or mixtures thereof Each L group may be linear, branched, cyclic, or a combination thereof. In any one R group (i.e., any one of Rl, R2, R3 and R4) the total number of heteroatoms (i.e., atoms that are neither H nor C) is from 0 to 6.
Independently, in any one R group the total number of non-hydrogen atoms is 50 or less. Each Z
is a monovalent radical. Each Z is independently selected from the group consisting of hydrogen, halo, cyano, nitro, nitroso, azido, chlorate, bromate, iodate, isocyanato, isocyanido, isothiocyanato, pentafluorothio, and a chemical group G, wherein G is a 3 to 14 membered ring system.
[00159] The Rl, R2, R3, and R4 groups are independently selected from the suitable groups.
Among the groups that are suitable for use as one or more of Rl, R2, R3, and R4 are, for example, aliphatic groups, aliphatic-oxy groups, alkylphosphonato groups, cycloaliphatic groups, cycloalkylsulfonyl groups, cycloalkylamino groups, heterocyclic groups, aryl groups, heteroaryl groups, halogens, silyl groups, other groups, and mixtures and combinations thereof Groups that are suitable for use as one or more of Rl, R2, R3, and R4 may be substituted or unsubstituted.
[00160] Among the suitable Rl, R2, R3, and R4 groups are, for example, aliphatic groups.
Some suitable aliphatic groups include, for example, alkyl, alkenyl, and alkynyl groups. Suitable aliphatic groups may be linear, branched, cyclic, or a combination thereof.
Independently, suitable aliphatic groups may be substituted or unsubstituted.
[00161] As used herein, a chemical group of interest is said to be "substituted" if one or more hydrogen atoms of the chemical group of interest is replaced by a substituent.
[00162] Also among the suitable Rl, R2, R3, and R4 groups are, for example, substituted and unsubstituted heterocyclyl groups that are connected to the cyclopropene compound through an intervening oxy group, amino group, carbonyl group, or sulfonyl group;
examples of such Rl, R2, R3, and R4 groups are heterocyclyloxy, heterocyclylcarbonyl, diheterocyclylamino, and diheterocyclylaminosulfonyl.
[00163] Also among the suitable Rl, R2, R3, and R4 groups are, for example, substituted and unsubstituted heterocyclic groups that are connected to the cyclopropene compound through an intervening oxy group, amino group, carbonyl group, sulfonyl group, thioalkyl group, or aminosulfonyl group; examples of such Rl, R2, R3, and R4 groups are diheteroarylamino, heteroarylthioalkyl, and diheteroarylaminosulfonyl.
[00164] Also among the suitable Rl, R2, R3, and R4 groups are, for example, hydrogen, fluoro, chloro, bromo, iodo, cyano, nitro, nitroso, azido, chlorato, bromato, iodato, isocyanato, isocyanido, isothiocyanato, pentafluorothio; acetoxy, carboethoxy, cyanato, nitrato, nitrito, perchlorato, allenyl, butylmercapto, diethylphosphonato, dimethylphenylsilyl, isoquinolyl, mercapto, naphthyl, phenoxy, phenyl, piperidino, pyridyl, quinolyl, triethylsilyl, trimethylsilyl;
and substituted analogs thereof [00165] As used herein, the chemical group G is a 3 to 14 membered ring system. Ring systems suitable as chemical group G may be substituted or unsubstituted; they may be aromatic (including, for example, phenyl and napthyl) or aliphatic (including unsaturated aliphatic, partially saturated aliphatic, or saturated aliphatic); and they may be carbocyclic or heterocyclic.
Among heterocyclic G groups, some suitable heteroatoms are, for example, nitrogen, sulfur, oxygen, and combinations thereof. Ring systems suitable as chemical group G
may be monocyclic, bicyclic, tricyclic, polycyclic, spiro, or fused; among suitable chemical group G ring systems that are bicyclic, tricyclic, or fused, the various rings in a single chemical group G may be all the same type or may be of two or more types (for example, an aromatic ring may be fused with an aliphatic ring).
[00166] In one embodiment, one or more of Rl, R2, R3, and R4 is hydrogen or (C1-C10) alkyl.
In another embodiment, each of Rl, R2, R3, and R4 is hydrogen or (Ci-C8) alkyl. In another embodiment, each of Rl, R2, R3, and R4 is hydrogen or (C1-C4) alkyl. In another embodiment, each of Rl, R2, R3, and R4 is hydrogen or methyl. In another embodiment, Rl is (C1-C4) alkyl and each of R2, R3, and R4 is hydrogen. In another embodiment, Rl is methyl and each of R2, R3, and R4 is hydrogen, and the cyclopropene compound is known herein as 1-methylcyclopropene or "1-MCP."
[00167] In another embodiment, the cyclopropene is of the formula:
wherein R is a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, phenyl, or naphthyl group; wherein the substituents are independently halogen, alkoxy, or substituted or unsubstituted phenoxy. In one embodiment, R is C1_8 alkyl. In another embodiment, R is methyl.
[00168] In another embodiment, the cyclopropene is of the formula:
wherein Rl is a substituted or unsubstituted Ci-C4 alkyl, Ci-C4 alkenyl, Ci-C4 alkynyl, Ci-C4 cylcoalkyl, cylcoalkylalkyl, phenyl, or napthyl group; and R2, R3, and R4 are hydrogen. In another embodiment, the cyclopropene comprises 1-methylcyclopropene (1-MCP).
[00169] As used herein, the phrase "transgene vector" refers to a vector that contains an inserted segment of DNA, the "transgene" that is transcribed into mRNA or replicated as RNA
within a host cell. The phrase "transgene" refers not only to that portion of inserted DNA that is converted into RNA, but also those portions of the vector that are necessary for the transcription or replication of the RNA. A transgene typically comprises a gene-of-interest but needs not necessarily comprise a polynucleotide sequence that contains an open reading frame capable of producing a protein.
[00170] Meats, plants, or plant parts may be treated in the practice of the present invention.
One example is treatment of whole plants; another example is treatment of whole plants while they are planted in soil, prior to the harvesting of useful plant parts.
[00171] Any plants that provide useful plant parts may be treated in the practice of the present invention. Examples include plants that provide fruits, vegetables, and grains.
[00172] As used herein, the phrase "plant" includes dicotyledons plants and monocotyledons plants. Examples of dicotyledons plants include tobacco, Arabidopsis, soybean, tomato, papaya, canola, sunflower, cotton, alfalfa, potato, grapevine, pigeon pea, pea, Brassica, chickpea, sugar beet, rapeseed, watermelon, melon, pepper, peanut, pumpkin, radish, spinach, squash, broccoli, cabbage, carrot, cauliflower, celery, Chinese cabbage, cucumber, eggplant, and lettuce.
Examples of monocotyledons plants include corn, rice, wheat, sugarcane, barley, rye, sorghum, orchids, bamboo, banana, cattails, lilies, oat, onion, millet, and triticale.
Examples of fruit include banana, pineapple, oranges, grapes, grapefruit, watermelon, melon, apples, peaches, pears, kiwifruit, mango, nectarines, guava, persimmon, avocado, lemon, fig, and berries.
[00173] Those skilled in the art would understand certain variation can exist based on the disclosure provided. Thus, the following examples are given for the purpose of illustrating the invention and shall not be construed as being a limitation on the scope of the invention or claims.
EXAMPLES
Example 1 ¨ Preparation of Sample 1 [00174] 3.20 g of 5-fluoro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole (21.2 mmol) and 3.20 g of ethylene glycol (51.6 mmol) are heated in 40 g of toluene. The toluene water azeotrope is distilled out of the system until the head temperature reached 110 C. The toluene is removed via rotary evaporator and the excess ethylene glycol is removed by kugelrohr distillation at about 20 torr and 100 C bath temperature. Recrystallization from toluene generates 2.95 g of white crystals, mp 145-149 C. Proton nmr shows spectra and integration consistent with the two to one product below:
\
F 0 \ __________________________________ O)B
Example 2 ¨ Preparation of Sample 2 [00175] 3.00 g of 1,3-dihydro-1-hydroxy-2,1-benzoxaborole (22.4 mmol) and 3.00 g of ethylene glycol (46.9 mmol) are heated in 40 g of toluene. The toluene water azeotrope is distilled out of the system until the head temperature reached 110 C. The toluene is removed via rotary evaporator and the excess ethylene glycol is removed by kugelrohr distillation at about 20 torr and 100 C bath temperature. Recrystallization from toluene generates 2.49 g of white crystals, mp 118 ¨ 120.5 C. Proton NMR shows spectra and integration consistent with the two to one product.
Example 3 ¨ Preparation of Sample 3 [00176] 3.17 g of 5-fluoro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole (21.0 mmol) and 3.22 g of pinacol (27.3 mmol) are heated in 40 g of toluene. The toluene water azeotrope is distilled out of the system until the head temperature reached 110 C. The toluene is removed via rotary evaporator and the excess pinacol is removed by kugelrohr distillation at about 20 ton and 120 C bath temperature. Recrystallization from hexane generatese 3.21 g of white crystals, mp 81-89 C. Proton NMR shows spectra and integration consistent with the two to one product.
Example 4 ¨ Preparation of Sample 4 [00177] 3.0 g of 5-fluoro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole (19.9 mmol) and 2.5 g of 1,2-propanediol (propylene glycol; 32.9 mmol) are heated in 40 g of toluene.
The toluene water azeotrope is distilled out of the system until the head temperature reached 110 C. The toluene is removed via rotary evaporator and the excess propylene glycol is removed by kugelrohr distillation at about 20 ton and 110 C bath temperature. Recrystallization from hexane generates 3.49 g of white crystals, mp 65.5-68.5 C. Proton NMR shows spectra and integration consistent with the two to one product.
Example 5 - In Vitro Analysis [00178] 12-well (7 ml volume per well) microtiter plates are used for the in vitro inhibition assay for volatile antimicrobial compounds. A 3-ml volume of full-strength Potato Dextrose Agar (PDA) is added to each well. After cooling, 1 iut of 1 x 106 per ml Botrytis cinerea spore suspension is spot pipette to the centre of the agar. For the first experiment, inoculated plates are allowed to germinate for 5 days at 4 C. For the second experiment, plates are inoculated immediately prior to volatile fungicide treatment. Small Whatman #1 filter disks (Cat. No.
1001-0155) are placed, in duplicate, on the underside of a polyethylene PCR
plate sealing film.
For determination of the minimum inhibitory concentration (MIC), test compounds are diluted in acetone, and the appropriate amount of compound is added to disks in a dose dependent manner (1.25 to 0.0006 mg/disk).
Table 1. Antimicrobial activities of Samples 1-4 MIC mg/1 BOT
ID RCI PENIEX ALTEAL MONIFR GLOMCI
Sample 1 <0.6 8.9 2.2 --- ---Sample 2 <0.6 8.9 8.9 35.7 142.9 Sample 3 <0.6 4.5 2.2 --- ---Sample 4 <0.6 8.9 1.1 --- ---[00179] The acetone is permitted to evaporate for 5 minutes. The headspace around the Botrytis cinerea inoculum is then sealed inside the well by the film with the adhering disk containing the fungicide. Plates are inverted, placed over the treated disks and sealed to prevent any of the chemical from flakin from the disk and falling onto the inoculated agar. After 14 days of storage at 4 C, cultures are evaluated for percent growth relative to control. Regardless of whether the spores had germinated for 5 days, or if the treatment commenced soon after inoculation of the plates (-15 minutes); there is 100% control of the fungal pathogen down to 0.005 mg. Samples 1-4 show good antimicrobial activity against Botrytis and/or other pathogens in this in vitro analysis. Minimum inhibitory concentrations (MIC) are shown in Tables 1 and 2 for results from two separate tests.
Table 2. Antimicrobial activities of Samples 1-4 (repeat test) MIC mg/1 BOT
ID RCI PENIEX ALTEAL MONIFR GLOMCI
Sample 1 0.6 --- >2.2 2.2 ---Sample 2 2.2 8.9 --- --- ---Sample 3 1.1 --- >2.2 1.1 ---Sample 4 0.6 --- >2.2 1.1 ---Example 6 ¨ Grape In Vivo Analysis [00180] In order to assess the in vivo activity of volatile antimicrobial compounds, a volatile bioassay is developed using green table grape. Fruit are placed individually inside a 20 ml scintillation vial, with the stem wound facing upwards. The fresh stem wound is inoculated with iut of 1 x 106 per ml Botrytis cinerea spore suspension. Whatman filter paper (Cat. No.
1822-024) is placed inside duplicate vial caps. For determination of the MIC, test compounds are diluted in acetone, and the appropriate amount of compound is added to disks in a dose dependent manner (for example 2.5 to 0.0024 mg/disk). The acetone is permitted to evaporate for 5 minutes. The vials are then capped with the lids containing the fungicide, and placed for 14 days at 4 C. After storage, fruit are evaluated for incidence of disease and appearance of phytotoxicity. Samples 1-4 show good antimicrobial activity against Botrytis in this in vivo analysis.
Example 7¨ Strawberry In Vivo Analysis [00181] In order to assess the in vivo activity of volatile antimicrobial compounds, a volatile bioassay is developed using strawberry. Two fruit are placed inside a 240 ml jar, with the calyx facing downwards. A fresh wound is inoculated with 20 iut of 1 x 106 per ml Botrytis cinerea spore suspension. Whatman filter paper (Cat. No. 1822-024) is placed inside duplicate jar lids.
For determination of the MIC, test compounds are diluted in acetone, and the appropriate amount of compound is added to disks in a dose dependent manner (for example 2.5 to 0.005 mg/disk).
The acetone is permitted to evaporate for 5 minutes. The jars are then capped with the lids containing the fungicide, and placed for 5 days at 21 C. After storage, fruit are evaluated for incidence and severity of disease and appearance of phytotoxicity. Samples 1-4 show good antimicrobial activity against Botrytis in this in vivo analysis.
Example 8 - Additional Strawberry In Vivo Analysis [00182] In order to assess the in vivo dose by time activity of volatile antimicrobial compounds, a volatile bioassay is developed using strawberry. Two fruit are placed inside a 240 ml jar, with the calyx facing downwards. A fresh wound is inoculated with 20 iut of 1 x 106 per ml Botrytis cinerea spore suspension. Whatman filter paper (Cat. No. 1822-024) is placed inside duplicate jar lids. Test samples are diluted in acetone, and the appropriate amount of compound is added to disks for example at two rates 0.008 or 0.125 mg. The acetone is permitted to evaporate for 5 minutes. The jars are capped with the lids containing the fungicide, and incubated with the volatile fungicide for 1, 3, 6, 24 or 72 hours. After incubation, lids containing the disk with test compounds are replaced with new lids without test compounds. All samples are maintained at 21 C for 3 days, then lids are removed and maintained for an additional 48 hours, all at 90% R.H. Fruit are evaluated for incidence and severity of disease and appearance of phytotoxicity. Samples 1-4 show good antimicrobial activity against Botrytis in this in vivo analysis.
Example 9 ¨ Antimicrobial Activity Against Bacteria [00183] 12-well (7 ml volume per well) microtiter plates are used for the in vitro inhibition assay for volatile antimicrobial compounds. A 3-ml volume of full-strength LB
Agar is added to each well. After cooling, 15 iut of Escherichia coli, adjusted to an optical density of 0.02 to 0.035, and further diluted 1/10 is pipette to the centre of the agar and tilted to distribute uniformly. Small Whatman #1 filter disks (Cat. No. 1001-0155) are placed, in duplicate, on the underside of a polyethylene PCR plate sealing film. For determination of the minimum inhibitory concentration (MIC), test compounds are diluted in acetone, and 5 mg of compound is added to disks. The acetone is permitted to evaporate for 5 minutes. The headspace around the Escherichia coli inoculum is then sealed inside the well by the film with the adhering disk containing the fungicide. Plates are inverted, placed over the treated disks and sealed to prevent any of the chemical from flaking from the disk and falling onto the inoculated agar. After 3 days of storage at 4 C, cultures are transferred to 23 C for an additional 2 days, and then evaluated for colony growth relative to control. Samples 1-4 show good antimicrobial activity against Escherichia coli in this in vitro analysis.
Claims (20)
1 A compound having a structure of formula (A):
R A - L A - G - L B - R B (A) wherein each of R A and R B is independently derived from a member selected from the group consisting of 5-fluoro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole; 5-chloro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole; 1,3-dihydro-1-hydroxy-2,1-benzoxaborole; and combinations thereof;
the ¨ L A ¨ G ¨ L B ¨ portion of formula (A) is derived from a diol or diamine compound; the diol compound is selected from the group consisting of 1,2-ethylene glycol;
1,2-propylene glycol; 1,3-propylene glycol; 1,1,2,2-tetramethyl-1,2-ethylene glycol; 2,2-dimethyl-1,3-propylene glycol; 1,6-hexanediol; 1,10-decanediol; and combinations thereof;
and the diamine compound is 1,2-ethylene diamine; 1,3-propylene diamine; or combinations thereof;
G is a substituted or unsubstituted C1-8 -alkylene;
and agriculturally acceptable salts thereof.
and the diamine compound is 1,2-ethylene diamine; 1,3-propylene diamine; or combinations thereof;
G is a substituted or unsubstituted C1-8 -alkylene;
and agriculturally acceptable salts thereof.
2. The compound of claim 1, wherein the compound is volatile.
3. The compound of claim 1, wherein the compound has antimicrobial activity.
4. The compound of claim 1, wherein G is selected from -CH2-, -CH2-CH2-, -CH2C-CH2-CH2-, -CH(CH3)-CH2-, -C(CH3)2-C(CH3)2-, and -CH2-C(CH3)2-CH2-.
5. The compound of claim 1, wherein each of R A and R B is independently
6. The compound of claim 1, wherein the compound has the structure of
7. A method of using a compound against pathogens affecting meats, plants, or plant parts, comprising contacting the meats, plants, or plant parts with an effective amount of a compound having a structure of formula (A):
R A - L A - G - L B - R B (A) wherein each of R A and R B is independently a radical comprising an oxaborole moiety;
each of L A and L B is independently -O-, or each of R and R' is independently hydrogen, unsubstituted or substituted C1-18-alkyl, arylalkyl, aryl, or heterocyclic moiety; and G is a substituted or unsubstituted C1-18 -alkylene, arylalkylene, arylene, or heterocyclic moiety;
and agriculturally acceptable salts thereof.
R A - L A - G - L B - R B (A) wherein each of R A and R B is independently a radical comprising an oxaborole moiety;
each of L A and L B is independently -O-, or each of R and R' is independently hydrogen, unsubstituted or substituted C1-18-alkyl, arylalkyl, aryl, or heterocyclic moiety; and G is a substituted or unsubstituted C1-18 -alkylene, arylalkylene, arylene, or heterocyclic moiety;
and agriculturally acceptable salts thereof.
8. The method of claim 7, wherein each of R A and R B is independently derived from a member selected from the group consisting of 5-fluoro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole; 5-chloro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole; 1,3-dihydro-1-hydroxy-2,1-benzoxaborole; and combinations thereof;
the ¨ L A - G ¨ L B ¨ portion of formula (A) is derived from a diol or diamine compound; the diol compound is selected from the group consisting of 1,2-ethylene glycol;
1,2-propylene glycol; 1,3-propylene glycol; 1,1,2,2-tetramethyl-1,2-ethylene glycol; 2,2-dimethyl-1,3-propylene glycol; 1,6-hexanediol; 1,10-decanediol; and combinations thereof;
and the diamine compound is 1,2-ethylene diamine; 1,3-propylene diamine; or combinations thereof;
G is a substituted or unsubstituted C1-8 ¨alkylene;
and agriculturally acceptable salts thereof.
the ¨ L A - G ¨ L B ¨ portion of formula (A) is derived from a diol or diamine compound; the diol compound is selected from the group consisting of 1,2-ethylene glycol;
1,2-propylene glycol; 1,3-propylene glycol; 1,1,2,2-tetramethyl-1,2-ethylene glycol; 2,2-dimethyl-1,3-propylene glycol; 1,6-hexanediol; 1,10-decanediol; and combinations thereof;
and the diamine compound is 1,2-ethylene diamine; 1,3-propylene diamine; or combinations thereof;
G is a substituted or unsubstituted C1-8 ¨alkylene;
and agriculturally acceptable salts thereof.
9. The method of claim 7, wherein the compound is volatile.
10. The method of claim 7, wherein the compound is a fungicide.
11. The method of claim 7, wherein G is selected from -CH2-, -CH2-CH2-, -CH2-CH2-, -CH(CH3)-CH2-, -C(CH3)2-C(CH3)2-, and -CH2-C(CH3)2-CH2-.
12. The method of claim 7, wherein each of R A and R B is independently
13. The method of claim 7, wherein the compound has the structure of
14. The method of claim 7, wherein the meats, plants, or plant parts are selected from the group consisting of barley, camphor tree, canola, castor-oil plant, cinnamon, cocoa, coffee, corn, cotton, flax, grapevine, hemp, hops, jute, maize, mustard, nuts, oat, poppy, rape, rice, rubber plant, rye, sunflower, sorghum, soybean, sugar cane, tea, tobacco, and wheat.
15. The method of claim 7, wherein the plants are selected from the group consisting of banana, pineapple, citrus, grapes, watermelon, cantaloupe, muskmelon, and other melons, apple, peach, pear, cherry, kiwifruit, mango, nectarine, guava, papaya, persimmon, pomegranate, avocado, fig, citrus, and berries.
16. The method of claim 7, wherein the compound has a structure of formula (A1) or (A2):
wherein each of A1, A2, D1, and D2 is independently hydrogen, substituted or unsubstituted C1-18-alkyl, arylalkyl, aryl, or heterocyclic; or A1 and D1, or A2 and D2 together form a 5, 6, or 7-membered fused ring which is substituted or unsubstituted;
each of R16, R17, R18, and R19 is independently hydrogen, substituted or unsubstituted C1-6-alkyl, nitrile, nitro, aryl or aryl alkyl; or R16 and R17, or R18 and R19 together form an alicyclic ring which is substituted or unsubstituted;
B is boron; and G is a substituted or unsubstituted C1-18-alkylene, arylalkylene, arylene, or heterocyclic moiety;
and agriculturally acceptable salts thereof.
wherein each of A1, A2, D1, and D2 is independently hydrogen, substituted or unsubstituted C1-18-alkyl, arylalkyl, aryl, or heterocyclic; or A1 and D1, or A2 and D2 together form a 5, 6, or 7-membered fused ring which is substituted or unsubstituted;
each of R16, R17, R18, and R19 is independently hydrogen, substituted or unsubstituted C1-6-alkyl, nitrile, nitro, aryl or aryl alkyl; or R16 and R17, or R18 and R19 together form an alicyclic ring which is substituted or unsubstituted;
B is boron; and G is a substituted or unsubstituted C1-18-alkylene, arylalkylene, arylene, or heterocyclic moiety;
and agriculturally acceptable salts thereof.
17. The method of claim 7, wherein each of R A and R B is independently derived from the group consisting of 5-fluoro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole;
5-chloro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole; 1,3-dihydro-1-hydroxy-2,1-benzoxaborole; and combinations thereof.
5-chloro-1,3-dihydro-1-hydroxy-2,1-benzoxaborole; 1,3-dihydro-1-hydroxy-2,1-benzoxaborole; and combinations thereof.
18. The method of claim 7, wherein the ¨ L A ¨ G ¨ L B ¨ portion of formula (A) is derived from a diol or diamine compound.
19. The method of claim 18, wherein the diol compound is selected from the group consisting of 1,2-ethylene glycol; 1,2-propylene glycol; 1,3-propylene glycol;
1,1,2,2-tetramethyl-1,2-ethylene glycol; 2,2-dimethyl-1,3-propylene glycol; 1,6-hexanediol;
1,10-decanediol; and combinations thereof.
1,1,2,2-tetramethyl-1,2-ethylene glycol; 2,2-dimethyl-1,3-propylene glycol; 1,6-hexanediol;
1,10-decanediol; and combinations thereof.
20. The method of claim 18, wherein the diamine compound is 1,2-ethylene diamine; 1,3-propylene diamine; or combinations thereof.
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US9737075B2 (en) * | 2015-04-09 | 2017-08-22 | The Penn State Research Foundation | Synergistic benzoxaborole-containing anti-fungicidal composition |
US10457695B2 (en) | 2016-01-18 | 2019-10-29 | Glenmark Life Sciences Limited | Process for the preparation of tavaborole |
TW201735792A (en) * | 2016-03-07 | 2017-10-16 | 農業保鮮股份有限公司 | Synergistic methods of using benzoxaborole compounds and preservative gases as an antimicrobial for crops |
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US11834466B2 (en) | 2017-11-30 | 2023-12-05 | 5Metis, Inc. | Benzoxaborole compounds and formulations thereof |
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US8106031B2 (en) | 2006-05-02 | 2012-01-31 | Anacor Pharmaceuticals, Inc. | Hydrolytically-resistant boron-containing therapeutics and methods of use |
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